expert-retention-letter-apex.docx

1007-00005 · Calderwood & Harkness LLP · Engagement

expert-retention-letter-apex.docx DOCUMENT Litigation

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CALDERWOOD & HARKNESS LLP 200 South Wacker Drive, Suite 3100 Chicago, IL 60606 Telephone: (312) 555-7400 Facsimile: (312) 555-7401 www.calderwoodharkness.com

March 18, 2022

Dr. Stefan Vorhaus, Ph.D. Apex Metallurgical Consulting, Inc. 3050 Huron Parkway, Suite B Ann Arbor, MI 48105

Re: Retention of Apex Metallurgical Consulting, Inc. for Independent Failure Analysis — *Vantage Mobility Systems Corp. v. Meridian Powertrain Holdings, Inc.* Warranty-Chargeback Dispute; Calderwood & Harkness Matter No. 1007-00005

Dear Dr. Vorhaus:

This letter sets forth the terms and conditions under which Calderwood & Harkness LLP ("Calderwood & Harkness" or the "Firm") proposes to retain Apex Metallurgical Consulting, Inc. ("Apex" or the "Expert") to perform an independent metallurgical failure analysis in connection with the matter referenced above. We have appreciated our preliminary conversations with you regarding your qualifications and laboratory capabilities, and we believe Apex is well-suited to provide the independent technical analysis required in this engagement. The purpose of this letter is to memorialize the specific terms of that retention, including the scope of work, fee structure, confidentiality obligations, and related matters.

Please review this letter carefully. If the terms are acceptable, please countersign where indicated at the end of this letter and return one executed copy to my attention. The engagement shall commence upon receipt of your countersigned letter.

1. Purpose of Engagement and Retention Context

Calderwood & Harkness LLP represents Vantage Mobility Systems Corp. ("Vantage" or "VMS"), a Delaware corporation with its principal place of business at 4280 Mound Road, Sterling Heights, Michigan 48310, in connection with a commercial warranty-chargeback dispute initiated by Meridian Powertrain Holdings, Inc. ("Meridian"), an Illinois corporation with its principal place of business at 2200 North Meacham Road, Suite 400, Schaumburg, Illinois 60173.

By way of brief background on the parties and their commercial relationship: Meridian is Vantage's largest customer and is a Tier-1 automotive supplier specializing in automatic transmission systems, which it supplies to multiple original equipment manufacturers ("OEMs"). Vantage is a Tier-2 manufacturer of precision-machined aluminum and steel components, supplying Meridian with a range of critical drivetrain parts. The commercial relationship between Vantage and Meridian dates back to approximately 2016 and is of substantial value to both parties.

The present dispute arises from Meridian's issuance of three Warranty Chargeback Notices — designated WCN-2021-1247, WCN-2022-0103, and WCN-2022-0289 — under the parties' Long-Term Supply Agreement (Reference No. LTSA-MPT-2020-0315, executed March 15, 2020) (the "LTSA"). In those notices, Meridian alleges that Vantage supplied defective precision-machined aluminum valve body housings (Part Nos. VMS-4400A through VMS-4400F) that caused field failures in Meridian's 8-speed automatic transmission modules (Meridian Model MPT-8AT). The aggregate chargebacks claimed by Meridian total $4,870,550.20 across 11,814 units, representing a significant potential financial exposure for our client.

Vantage contests the validity of these chargebacks and maintains that the field failures are not attributable to defects in its valve body housings. A more detailed summary of the factual background is provided in Section 3 below for your reference as you undertake the engagement.

In light of this dispute, Calderwood & Harkness, on behalf of Vantage, hereby retains Apex Metallurgical Consulting, Inc. to perform an independent failure analysis of the returned valve body housings that are the subject of the chargeback notices. The engagement is assigned Calderwood & Harkness Matter No. 1007-00005, which should be referenced on all correspondence and invoices related to this matter.

The primary contact at Calderwood & Harkness for this engagement is Carlos Espinoza, Lead Associate, Litigation (General). Mr. Espinoza may be reached at (312) 555-7438 or cespinoza@calderwoodharkness.com. The responsible partner for this matter is Samuel Eklund, who may be reached at (312) 555-7412 or seklund@calderwoodharkness.com. All substantive communications regarding this engagement should be directed to Mr. Espinoza or Mr. Eklund as set forth more fully below.

2. Attorney-Client Privilege and Work-Product Protection

The protections described in this Section are of critical importance to the engagement and must be carefully observed at all times.

Apex's retention is made at the express direction of counsel, Calderwood & Harkness LLP, in anticipation of potential litigation between Vantage and Meridian. While no formal litigation or arbitration proceeding has been filed as of the date of this letter, the dispute is such that litigation or arbitration is reasonably anticipated, and this engagement is being structured accordingly to preserve all applicable privileges.

All communications between Apex and Calderwood & Harkness, including but not limited to oral discussions, written correspondence, e-mails, memoranda, and telephone conferences, and all work product generated by Apex in connection with this engagement, including but not limited to reports, draft reports, notes, data, analyses, and opinions, are intended to be protected by the attorney-client privilege and the attorney work-product doctrine as recognized under applicable federal and state law. Apex's work is being performed for the purpose of assisting counsel in rendering legal advice to Vantage and in anticipation of potential litigation, and the protections afforded by these doctrines are essential to the effective representation of our client.

In furtherance of these protections, the following requirements shall apply:

(a) Apex shall not disclose any findings, reports, data, opinions, or communications related to this engagement to any third party — including but not limited to Meridian, Meridian's counsel, any OEM, any other expert or consultant, or any media representative — without the prior written consent of Calderwood & Harkness LLP.

(b) All documents, reports, memoranda, and materials prepared by Apex in connection with this engagement shall be prominently marked with the following designation or a substantially equivalent designation:

"PRIVILEGED AND CONFIDENTIAL — PREPARED AT THE DIRECTION OF COUNSEL — ATTORNEY WORK PRODUCT"

(c) Apex shall direct all communications regarding the engagement exclusively to Carlos Espinoza or Samuel Eklund at Calderwood & Harkness LLP. Apex shall not communicate directly with any Vantage personnel — including but not limited to Vantage's VP of Quality, Thomas Reinhardt, or any other Vantage engineer, quality inspector, or management-level employee — unless specifically directed to do so by Calderwood & Harkness in writing. This restriction is essential to maintaining the integrity of the privilege.

(d) Apex acknowledges and agrees that it is Calderwood & Harkness LLP, not Vantage directly, that is directing the scope, methodology, and priorities of the work performed under this engagement. While Vantage is the ultimate client and payor, the engagement is structured as a retention by counsel for purposes of privilege preservation. Apex shall take direction from Calderwood & Harkness on all matters relating to the scope and conduct of the engagement.

We emphasize that the inadvertent disclosure of privileged information could result in a waiver of the privilege, with potentially significant adverse consequences for our client's legal position. Apex and all Apex personnel performing work under this engagement must exercise the utmost care to avoid any such disclosure.

3. Background Summary for Expert's Reference

The following background summary is provided for Apex's reference in connection with the engagement. This summary is based on information currently available to Calderwood & Harkness and is subject to supplementation as additional facts are developed. This summary is itself privileged and confidential and should be treated accordingly.

3.1 The Supply Relationship

Vantage and Meridian have maintained a commercial supply relationship since approximately 2016. During that time, Vantage has supplied range precision-machined aluminum and steel components to Meridian for incorporation into Meridian's transmission systems.

The current governing contract between the parties is the Long-Term Supply Agreement, Reference No. LTSA-MPT-2020-0315, executed March 15, 2020, with a five-year term running through March 14, 2025 (the "LTSA"). Under the LTSA, Vantage supplies precision-machined aluminum valve body housings — specifically, Part Numbers VMS-4400A through VMS-4400F — to Meridian's assembly plant located in Schaumburg, Illinois. These six part numbers represent variants of the same core component, differentiated by minor machining features that correspond to different transmission configurations.

Annual production volumes under the LTSA are approximately 480,000 units at a weighted average unit price of $78.50, representing annual revenues to Vantage of approximately $37.68 million. This makes the Meridian program one of Vantage's most significant revenue streams and underscores the commercial significance of the dispute.

The valve body housings supplied by Vantage are integrated into Meridian's 8-speed automatic transmission modules (Meridian Model MPT-8AT). The MPT-8AT is supplied by Meridian to three OEM customers (the identities of which are subject to Meridian's confidentiality restrictions but are known to counsel). The valve body housing is a critical structural and hydraulic component of the transmission, serving as the mounting platform for the solenoid pack and providing the internal fluid passages that control shift actuation.

3.2 The Alleged Defect

Beginning in or around October 2021, Meridian's OEM customers began reporting transmission solenoid-circuit malfunctions in vehicles equipped with MPT-8AT transmissions. The reported symptoms included erratic shift behavior, delayed engagements, and, in certain cases, activation of the transmission's "limp-mode" — a protective operating mode that limits the transmission to a single gear ratio to prevent further damage.

Meridian has asserted that the root cause of these field failures is micro-porosity in the valve body housings supplied by Vantage. Specifically, Meridian claims that porosity in the aluminum casting — particularly in the regions surrounding the solenoid bores — allowed hydraulic fluid to bypass intended fluid passages, resulting in pressure losses within the solenoid circuits. According to Meridian, this pressure loss led to the erratic shift behavior and limp-mode activations reported by the OEMs.

The applicable engineering specification governing the manufacture of the valve body housings is Meridian Engineering Drawing Set MER-DWG-4400, Revision C ("Rev. C"). Rev. C specifies a maximum porosity threshold of ASTM E505 Level 2. Meridian contends that a significant number of the returned units exhibit porosity exceeding this Level 2 threshold and that this excess porosity is the proximate cause of the field failures.

It should be noted that ASTM E505 (Standard Reference Radiographs for Inspection of Aluminum and Magnesium Die Castings) establishes a grading system for porosity in cast aluminum components based on reference radiographs, with Level 1 representing the least porosity and Level 4 representing the most. A Level 2 maximum threshold is a moderately stringent specification that is common in precision hydraulic applications.

3.3 Vantage's Position

Vantage vigorously contests Meridian's allegations and contends that its valve body housings were manufactured in full conformity with the requirements of MER-DWG-4400, Rev. C, including the ASTM E505 Level 2 maximum porosity threshold.

In support of its position, Vantage points to its extensive internal quality records, including its Production Part Approval Process ("PPAP") documentation and its ongoing Statistical Process Control ("SPC") data for Part Nos. VMS-4400A through VMS-4400F. According to Vantage's quality records, 97.3% of sampled parts met ASTM E505 Level 1 (the most stringent level), and 100% of sampled parts met ASTM E505 Level 2 (the contractually specified threshold). These quality records span the relevant production periods and represent a statistically significant sample of output.

Critically, Vantage has identified an alternative potential cause for the field failures. Vantage's Vice President of Quality, Thomas Reinhardt, has identified that Meridian implemented a change to its torque-wrench calibration protocol in August 2021 — approximately two months before the first OEM field-failure reports emerged in October 2021. Vantage believes, and intends to demonstrate through the analysis performed under this engagement, that the field failures may be attributable, in whole or in part, to inadequate torque on the solenoid-pack retaining bolts during Meridian's final assembly process at its Schaumburg facility.

The applicable torque specification for the solenoid-pack retaining bolts is 12 Nm (Newton-meters), as set forth in Meridian's own assembly work instructions. If the retaining bolts were insufficiently torqued — for example, due to improperly calibrated torque wrenches — the solenoid pack could fail to seal properly against the valve body surface, allowing fluid leakage at the gasket interface. Such a leakage pattern would produce symptoms substantially identical to those caused by casting porosity, including pressure losses, erratic shift behavior, and limp-mode activation. The temporal correlation between the calibration protocol change and the onset of field failures is, in Vantage's view, significant.

3.4 The Chargeback Notices

Meridian has issued three Warranty Chargeback Notices under the LTSA, each claiming reimbursement for costs associated with field failures allegedly caused by Vantage's valve body housings. The notices are summarized as follows:

The per-unit chargeback amount of $412.30 is computed by Meridian as follows:

Vantage has raised a number of objections to the chargeback notices, including challenges to the per-unit cost calculations, the failure-analysis methodology employed by Meridian, and Meridian's compliance with the notice and inspection provisions of the LTSA. Of particular relevance to this engagement, Vantage has noted that the returned parts from the first chargeback notice (WCN-2021-1247) were not made available for Vantage's inspection until 52 days after the notice was issued, and that 2,108 of the 3,842 units referenced in that first notice were never tendered for inspection at all. These chain-of-custody issues may bear on the evidentiary weight of any analysis of those particular units.

4. Scope of Work

The scope of work for this engagement encompasses the tasks described in Sections 4.1 through 4.6 below. Apex shall perform all work in accordance with generally accepted metallurgical engineering standards and practices and in a manner consistent with the independence and objectivity requirements set forth in Section 10 of this letter.

4.1 Metallurgical Examination of Returned Parts

Apex shall perform a comprehensive metallurgical examination of returned valve body housings (Part Nos. VMS-4400A through VMS-4400F) provided by Meridian and/or made available through counsel. The examination shall be conducted at Apex's laboratory facility in Ann Arbor, Michigan, or at such other location as may be mutually agreed upon by the parties.

The examination techniques employed by Apex shall include, at a minimum, the following:

(a) Visual inspection of each returned unit, including documentation of external surface condition, visible defects, damage, corrosion, contamination, and any evidence of prior disassembly, handling, or testing by Meridian or its agents;

(b) Dimensional measurement of critical features, including solenoid bore diameters, gasket sealing surfaces, and bolt-hole locations, to verify conformance with MER-DWG-4400, Rev. C, tolerances;

(c) Optical microscopy of metallurgical cross-sections, including examination of microstructure, grain size, and porosity characteristics at appropriate magnifications;

(d) Scanning electron microscopy ("SEM"), including energy-dispersive X-ray spectroscopy ("EDS") where appropriate, for high-resolution imaging and compositional analysis of porosity sites, fracture surfaces, and other areas of interest; and

(e) Any other non-destructive and destructive testing methods deemed appropriate by Dr. Vorhaus in the exercise of his professional judgment, including but not limited to radiographic examination, dye penetrant testing, hardness testing, and chemical composition analysis.

The sample set for examination will consist of returned units made available through Calderwood & Harkness's coordination with opposing counsel, Pratt, Givens & Lowell LLP (Rachel Drummond, Partner; Victor Saldana, Associate; 155 North Michigan Avenue, Suite 2700, Chicago, Illinois 60601). Calderwood & Harkness will arrange for the physical custody and transfer of the sample parts and will prepare and maintain appropriate chain-of-custody documentation to ensure the evidentiary integrity of all examined specimens. Apex shall maintain its own chain-of-custody log for all parts received, examined, and returned.

4.2 Porosity Assessment per ASTM E505

Apex shall evaluate each examined unit for porosity in accordance with ASTM E505 (Standard Reference Radiographs for Inspection of Aluminum and Magnesium Die Castings), with specific attention to whether porosity levels in the examined units exceed ASTM E505 Level 2, which is the maximum threshold specified in Meridian Engineering Drawing Set MER-DWG-4400, Rev. C.

The porosity assessment shall include localized porosity analysis, with particular focus on the regions surrounding the solenoid bores, which Meridian has identified as the critical failure zone. This localized analysis is important because overall porosity levels in a casting may meet specification while localized concentrations of porosity in hydraulically sensitive areas may nonetheless exceed acceptable limits.

Apex shall categorize each examined unit by ASTM E505 level and shall thoroughly document the location, size, morphology, and distribution of any porosity observed. Where destructive testing is performed (e.g., metallurgical cross-sectioning), Apex shall document the precise location and orientation of each section relative to the overall part geometry. Photographic and micrographic documentation of all significant findings shall be maintained and included in the written report.

4.3 Evaluation of Assembly-Related Failure Modes (Torque Evidence)

In addition to the porosity assessment, Apex shall examine each returned unit for physical evidence of assembly-related failure modes, with specific emphasis on evidence relating to the torque applied to the solenoid-pack retaining bolts during Meridian's final assembly process.

This analysis shall include, at a minimum:

(a) Examination of bolt-head witness marks on the valve body housing surface surrounding each bolt hole, including measurement and characterization of any impressions, deformation, or scoring indicative of bolt-tightening forces;

(b) Examination of gasket compression patterns on the solenoid-pack sealing surfaces, including assessment of whether the compression pattern is consistent with uniform application of the specified 12 Nm torque across all retaining bolts, or whether the pattern indicates non-uniform or insufficient clamping force;

(c) Examination of any thread damage, galling, or deformation in the bolt holes that may indicate improper fastener installation or removal;

(d) Assessment of any other physical indicia bearing on whether the solenoid-pack retaining bolts were tightened to Meridian's specified 12 Nm torque value, including but not limited to any marks or evidence left by torque-wrench engagement and any evidence of bolt re-use or replacement; and

(e) Documentation of each examined unit's overall condition at the bolt-hole and gasket-surface locations, with specific attention to distinguishing between manufacturing-related characteristics and assembly-related characteristics.

Apex shall assess whether the observed failure modes on each examined unit are consistent with insufficient bolt torque, casting porosity, or a combination of both factors, and shall document the basis for each such assessment.

4.4 Causation Analysis

Drawing upon the findings from the metallurgical examination (Section 4.1), porosity assessment (Section 4.2), and assembly-related failure mode evaluation (Section 4.3), Apex shall provide a professional engineering opinion as to the most probable root cause(s) of the field failures reported in connection with the MPT-8AT transmission. Specifically, Apex shall opine on whether the field failures are attributable to:

(a) Porosity in Vantage's aluminum valve body housing castings exceeding the ASTM E505 Level 2 specification;

(b) Insufficient torque applied to the solenoid-pack retaining bolts during Meridian's final assembly process;

(c) A combination of casting porosity and insufficient assembly torque acting in concert to produce the observed failures; or

(d) Other causes identified through Apex's analysis, including but not limited to material-composition anomalies, design deficiencies, service-environment factors, or improper repair or handling of returned units.

The causation analysis should address causation on a per-unit basis for each examined sample, providing a determination (or, where appropriate, a range of probable causes) for each individual unit. In addition, Apex shall provide aggregate statistical conclusions where the sample size and data quality permit, including any statistically significant correlations between porosity levels, assembly-torque evidence, production lot or date codes, and failure mode.

Apex shall specifically consider and address Meridian's August 2021 torque-wrench calibration protocol change as a potential contributing factor to the field failures, to the extent that the physical evidence permits such an assessment. Calderwood & Harkness will provide Apex with such information regarding the nature and timing of the calibration change as is available.

4.5 Preparation of Written Report

Apex shall prepare a detailed written report of its findings, methodology, data, and opinions (the "Report"). The Report shall be comprehensive and shall set forth, in sufficient detail to be understood by both technical and non-technical audiences, the following:

(a) A description of all examination techniques and methodologies employed;

(b) A description of each sample examined, including identification by part number, serial number or lot number (where available), and chargeback notice reference;

(c) All factual findings resulting from the metallurgical examination, porosity assessment, and assembly-related failure mode evaluation;

(d) Photographic and micrographic documentation of all significant findings, including annotated images where appropriate;

(e) Data tables summarizing porosity levels, dimensional measurements, and other quantitative findings for each examined unit and in aggregate;

(f) Any supporting analytical data, including SEM images, EDS spectra, and radiographic images;

(g) Apex's professional engineering opinions as to the most probable root cause(s) of the field failures, stated with the degree of certainty customary in the metallurgical engineering discipline; and

(h) A statement of Dr. Vorhaus's qualifications and relevant experience.

The Report shall be suitable for use in potential litigation or arbitration proceedings, including as the foundation for expert testimony, should such proceedings become necessary. The Report shall comply with the requirements of Federal Rule of Civil Procedure 26(a)(2)(B) to the extent applicable, in the event the dispute proceeds to federal litigation.

A preliminary report of findings is expected within approximately five (5) weeks of receipt of all sample parts for examination. Calderwood & Harkness and Apex will confer regarding the timeline as the engagement proceeds and will make adjustments as necessary based on the volume and condition of the sample set.

The Report, and all drafts thereof, shall be directed exclusively to Calderwood & Harkness LLP and shall be marked "PRIVILEGED AND CONFIDENTIAL — PREPARED AT THE DIRECTION OF COUNSEL — ATTORNEY WORK PRODUCT" in accordance with Section 2 of this letter.

4.6 Additional Services

If requested by Calderwood & Harkness, Apex may be asked to provide services beyond the initial scope of work described in Sections 4.1 through 4.5, including but not limited to:

(a) Supplemental analysis of additional returned units or additional testing on previously examined units;

(b) Preparation of rebuttal opinions in response to Meridian's failure-analysis data, reports, or expert opinions;

(c) Assistance with the preparation of demonstrative exhibits, tutorials, or visual aids for use in litigation or arbitration; and

(d) Expert testimony, whether by deposition, at trial, or in arbitration proceedings, including preparation for such testimony.

Any such additional services will be subject to the fee structure set forth in Section 6 below and will require prior written authorization from Calderwood & Harkness before work commences. Calderwood & Harkness will endeavor to provide Apex with reasonable advance notice of any anticipated additional-services requests.

5. Materials to Be Provided

Calderwood & Harkness will arrange for the following materials to be provided to Apex in connection with the engagement:

(a) Returned valve body housings — the physical sample set of returned units, to be coordinated through Calderwood & Harkness's discussions with opposing counsel and made available for examination in accordance with an agreed-upon inspection protocol and chain-of-custody procedures;

(b) Meridian Engineering Drawing Set MER-DWG-4400, Rev. C — the applicable engineering specification for the valve body housings, including dimensional tolerances, material specifications, and the ASTM E505 Level 2 porosity requirement;

(c) LTSA-MPT-2020-0315 — relevant excerpts of the Long-Term Supply Agreement between Vantage and Meridian, including but not limited to the warranty provisions set forth in Section 9 of the LTSA and the inspection and acceptance provisions;

(d) Vantage's PPAP documentation and ongoing SPC data for Part Nos. VMS-4400A through VMS-4400F, covering the production periods relevant to the chargeback notices;

(e) Meridian's Warranty Chargeback Notices — WCN-2021-1247, WCN-2022-0103, and WCN-2022-0289, including any attached exhibits, unit listings, or supporting documentation;

(f) Meridian's internal failure-analysis reports, to the extent such reports are obtained through the parties' informal document exchanges or, if litigation is commenced, through formal discovery;

(g) Information regarding Meridian's torque-wrench calibration protocol and the August 2021 change, as available through Calderwood & Harkness's investigation or through the discovery process; and

(h) Any additional documents or materials as necessary to support Apex's analysis, to be provided on a rolling basis as they become available.

Calderwood & Harkness will provide Apex with a transmittal letter or index accompanying each production of materials, and Apex shall maintain a log of all materials received. All materials provided to Apex remain the property of Calderwood & Harkness (or its client) and are subject to the confidentiality and return-of-materials provisions of this letter.

6. Fee Structure and Budget

6.1 Hourly Rates

Apex's services under this engagement shall be compensated on an hourly basis at the following rates:

These hourly rates shall apply to all work performed in connection with the engagement, including but not limited to examination and testing, data analysis, report preparation, communications with counsel, and travel time (billed at 50% of the applicable hourly rate). Should Apex propose to engage any additional personnel not encompassed by the categories above, Apex shall notify Calderwood & Harkness in advance and obtain approval for the applicable billing rate.

6.2 Estimated Budget

The estimated total budget for the initial scope of work described in Section 4 (Sections 4.1 through 4.5) is approximately $95,000. This estimate is based on the currently anticipated scope and volume of returned parts to be examined and assumes a sample set consistent with the units expected to be made available through the chargeback notice process.

The estimate is broken down approximately as follows:

This estimate is provided for planning purposes and is subject to adjustment based on the actual volume of parts examined, the complexity of the findings, and the extent of supplemental testing required. Apex will notify Calderwood & Harkness promptly if, at any point during the engagement, the actual scope of work is expected to exceed the estimated budget. Any material deviation from the budget — defined as a deviation greater than ten percent (10%) of the estimated total — will require prior written approval from Calderwood & Harkness before additional work is performed.

6.3 Invoicing and Payment

Apex shall submit monthly invoices to Calderwood & Harkness LLP, addressed to Carlos Espinoza, Lead Associate, Litigation (General), and referencing Matter No. 1007-00005. Invoices shall be submitted in writing (electronic submission by e-mail to cespinoza@calderwoodharkness.com is acceptable) and shall include a reasonable description of services performed during the billing period, hours expended by each personnel category, and an itemization of any out-of-pocket expenses incurred.

Invoices shall contain sufficient detail to permit Calderwood & Harkness to review and approve the charges but shall not include privileged or work-product-protected information in such detail as to risk disclosure of the substance of legal strategy. Calderwood & Harkness will provide guidance on appropriate invoice descriptions if needed.

Payment terms are net thirty (30) days from Calderwood & Harkness's receipt of a properly submitted invoice. Calderwood & Harkness LLP will be the party responsible for payment of Apex's fees and expenses; however, the parties acknowledge that Vantage Mobility Systems Corp. is the ultimate payor and that Calderwood & Harkness's ability to make timely payment is dependent upon receipt of funds from Vantage.

6.4 Expenses. Reasonable out-of-pocket expenses incurred by Apex in connection with the engagement shall be reimbursable at cost, without markup. Reimbursable expenses include, but are not limited to, the following:

(a) Travel expenses (airfare, ground transportation, lodging, and meals), incurred in connection with site visits, inspection activities, or meetings with counsel, at rates consistent with reasonable business practices;

(b) Shipping and handling costs for the transport of sample parts and materials;

(c) Laboratory consumables, including but not limited to mounting materials, polishing compounds, etchants, and SEM-related consumables; and

(d) Costs of specialized testing subcontracted to third-party laboratories (e.g., independent radiographic testing facilities or chemical analysis laboratories), where such subcontracting is deemed necessary by Apex and approved in advance by Calderwood & Harkness.

Prior approval from Calderwood & Harkness is required for any single expense item exceeding $1,000.00. Apex shall obtain such approval in writing (e-mail is sufficient) before incurring the expense. All expenses shall be documented with receipts or other supporting documentation and included in the monthly invoices described in Section 6.3.

7. Term and Termination

The engagement shall commence on the date of Apex's countersignature of this letter and shall continue until the scope of work described herein is completed or the engagement is terminated in accordance with this Section.

Either party may terminate the engagement upon fifteen (15) days' prior written notice to the other party. Termination by Calderwood & Harkness shall be without prejudice to Apex's right to compensation for work performed and expenses properly incurred through the effective date of termination. Termination by Apex shall be subject to Apex's professional obligation to avoid prejudice to the client's interests by providing reasonable transition assistance.

In the event of termination, whether by either party or upon completion of the engagement, Apex shall:

(a) Promptly return to Calderwood & Harkness all physical materials provided by Calderwood & Harkness in connection with the engagement, including but not limited to sample parts, documents, and other tangible materials;

(b) Deliver to Calderwood & Harkness all work product generated in connection with the engagement, including the Report (or any partially completed draft thereof), all supporting data, analyses, photographs, and other materials; and

(c) Retain no copies of any materials or work product, except as may be required by applicable law, professional licensing standards, or Apex's document-retention policies, in which case Apex shall notify Calderwood & Harkness of the nature and extent of any retained materials and shall continue to maintain such materials in confidence in accordance with the confidentiality provisions of this letter.

8. Confidentiality

Apex shall maintain in strict confidence all information, documents, and materials received from Calderwood & Harkness or any other source in connection with this engagement, as well as all findings, opinions, analyses, and work product generated by Apex in connection with this engagement (collectively, "Confidential Information"). The confidentiality obligations set forth in this Section are in addition to, and not in lieu of, the privilege-protection requirements set forth in Section 2 of this letter.

Apex shall not disclose any Confidential Information to any person or entity other than designated Calderwood & Harkness personnel (currently identified as Carlos Espinoza and Samuel Eklund) without the prior written consent of Calderwood & Harkness. Apex may disclose Confidential Information to its own employees and contractors who have a need to know such information in connection with the engagement, provided that each such individual is made aware of and agrees to comply with the confidentiality obligations set forth in this letter.

Apex shall implement reasonable physical, electronic, and procedural security measures to protect the confidentiality of all Confidential Information, including but not limited to secure storage of physical materials, password protection for electronic files, and restricted access to materials and work product.

The confidentiality obligations set forth in this Section shall survive the termination or completion of the engagement and shall continue in full force and effect indefinitely, or until Calderwood & Harkness provides written notice releasing Apex from such obligations.

9. Conflicts of Interest

Apex represents and warrants that it has conducted a reasonable conflict check and that, as of the date of its countersignature of this letter, Apex has no current engagement, financial interest, or other relationship with Meridian Powertrain Holdings, Inc., Pratt, Givens & Lowell LLP, or any other known party to the dispute that would create a conflict of interest or compromise Apex's independence and objectivity in performing the work described in this letter.

Without limiting the foregoing, Apex represents that neither Dr. Vorhaus nor any Apex employee anticipated to perform work under this engagement has served as a consultant, expert, or advisor to Meridian, to any of Meridian's OEM customers in connection with the MPT-8AT program, or to Pratt, Givens & Lowell LLP, at any time within the past five years.

Apex shall notify Calderwood & Harkness promptly if any conflict of interest or potential conflict of interest arises at any time during the course of the engagement, including but not limited to any new engagement, solicitation, or relationship involving Meridian, its counsel, or any other party with an interest in the dispute. The parties will confer in good faith to determine whether any such conflict can be appropriately managed or whether termination of the engagement is warranted.

10. Independent Expert Obligations

Apex acknowledges that, notwithstanding its retention by counsel for Vantage and the direction it receives from Calderwood & Harkness regarding scope and methodology, Apex's overriding obligation is to provide objective, independent, and scientifically sound opinions based on the evidence examined and the application of accepted metallurgical engineering principles.

Apex's findings and opinions shall not be influenced by the interests, litigation positions, or desired outcomes of any party, including Vantage. If Apex's analysis yields findings that are unfavorable to Vantage's position in the dispute, Apex shall report those findings honestly and completely to Calderwood & Harkness. Calderwood & Harkness will work with Apex to understand the implications of any such findings, but at no time will Calderwood & Harkness request or expect Apex to alter, suppress, or misrepresent its independent professional conclusions.

This commitment to independence and objectivity is essential both to the integrity of the analytical process and to the credibility of Apex's opinions should the matter proceed to litigation or arbitration. Apex's value as an expert depends upon its reputation for impartiality and scientific rigor, and Calderwood & Harkness fully respects and supports that commitment.

11. Insurance

Apex shall maintain professional liability insurance (errors and omissions coverage) in an amount not less than $2,000,000 per occurrence throughout the term of the engagement. Such coverage shall be provided by a carrier rated A- or better by A.M. Best Company. Apex shall provide Calderwood & Harkness with a certificate of insurance evidencing the required coverage upon request and shall notify Calderwood & Harkness promptly if the coverage is cancelled, materially modified, or allowed to lapse during the term of the engagement.

12. Governing Law

This engagement letter, and any disputes arising out of or relating to this letter or the engagement, shall be governed by and construed in accordance with the laws of the State of Illinois, without regard to its choice-of-law or conflict-of-laws principles.

13. Entire Agreement and Amendments

This letter constitutes the entire agreement between Calderwood & Harkness LLP and Apex Metallurgical Consulting, Inc. with respect to the subject matter hereof. It supersedes all prior and contemporaneous discussions, negotiations, understandings, and agreements, whether oral or written, relating to the engagement.

No amendment, modification, or waiver of any provision of this letter shall be effective unless made in writing and signed by authorized representatives of both parties. The failure of either party to enforce any provision of this letter shall not constitute a waiver of that provision or of the right to enforce it at a later time.

14. Counterparts and Acceptance

This letter may be executed in counterparts, including by facsimile or electronic (PDF) transmission, each of which shall be deemed an original and all of which together shall constitute one and the same instrument.

If the foregoing terms are acceptable to Apex, please indicate your acceptance by having Dr. Vorhaus countersign this letter in the space provided below and return one fully executed copy to my attention at Calderwood & Harkness LLP, 200 South Wacker Drive, Suite 3100, Chicago, Illinois 60606, or by electronic transmission to cespinoza@calderwoodharkness.com. We look forward to working with you on this engagement.

Very truly yours,

CALDERWOOD & HARKNESS LLP

By: ________

Carlos Espinoza Lead Associate, Litigation (General) 200 South Wacker Drive, Suite 3100 Chicago, IL 60606 Tel: (312) 555-7438 cespinoza@calderwoodharkness.com

cc: Samuel Eklund, Responsible Partner, Calderwood & Harkness LLP

ACCEPTANCE AND AGREEMENT

The undersigned, on behalf of Apex Metallurgical Consulting, Inc., hereby accepts and agrees to the terms and conditions of the engagement set forth in the foregoing letter dated March 18, 2022, from Calderwood & Harkness LLP.

ACCEPTED AND AGREED:

APEX METALLURGICAL CONSULTING, INC.

By: ________

Name: Dr. Stefan Vorhaus, Ph.D.

Title: Lead Expert / Metallurgical Engineer

Date: ________

Chargeback Notice	Date Issued	Units Claimed	Amount Claimed
WCN-2021-1247	December 6, 2021	3,842	$1,583,654.60
WCN-2022-0103	January 18, 2022	4,260	$1,756,398.00
WCN-2022-0289	February 7, 2022	3,712	$1,530,497.60
Total	11,814	$4,870,550.20
Component	Amount
Replacement part cost	$78.50
OEM dealer labor	$218.00
Meridian failure-analysis/logistics	$67.80
Administrative fee	$48.00
Total per unit	$412.30
Personnel Category	Hourly Rate
Dr. Stefan Vorhaus — Lead Expert / Metallurgical Engineer	$475.00
Senior Engineer / Analyst	$325.00
Junior Engineer / Analyst	$225.00
Laboratory Technician	$150.00
Task	Estimated Cost
Metallurgical examination and testing (Sections 4.1–4.3)	$52,000
Causation analysis (Section 4.4)	$18,000
Report preparation (Section 4.5)	$20,000
Laboratory consumables and materials	$5,000
Total estimated budget	$95,000

CALDERWOOD & HARKNESS LLP 200 South Wacker Drive, Suite 3100 Chicago, IL 60606 Telephone: (312) 555-7400 Facsimile: (312) 555-7401 www.calderwoodharkness.com
March 18, 2022
Dr. Stefan Vorhaus, Ph.D. Apex Metallurgical Consulting, Inc. 3050 Huron Parkway, Suite B Ann Arbor, MI 48105
Re: Retention of Apex Metallurgical Consulting, Inc. for Independent Failure Analysis — *Vantage Mobility Systems Corp. v. Meridian Powertrain Holdings, Inc.* Warranty-Chargeback Dispute; Calderwood & Harkness Matter No. 1007-00005
Dear Dr. Vorhaus:
This letter sets forth the terms and conditions under which Calderwood & Harkness LLP ("Calderwood & Harkness" or the "Firm") proposes to retain Apex Metallurgical Consulting, Inc. ("Apex" or the "Expert") to perform an independent metallurgical failure analysis in connection with the matter referenced above. We have appreciated our preliminary conversations with you regarding your qualifications and laboratory capabilities, and we believe Apex is well-suited to provide the independent technical analysis required in this engagement. The purpose of this letter is to memorialize the specific terms of that retention, including the scope of work, fee structure, confidentiality obligations, and related matters.
Please review this letter carefully. If the terms are acceptable, please countersign where indicated at the end of this letter and return one executed copy to my attention. The engagement shall commence upon receipt of your countersigned letter.
1. Purpose of Engagement and Retention Context
Calderwood & Harkness LLP represents Vantage Mobility Systems Corp. ("Vantage" or "VMS"), a Delaware corporation with its principal place of business at 4280 Mound Road, Sterling Heights, Michigan 48310, in connection with a commercial warranty-chargeback dispute initiated by Meridian Powertrain Holdings, Inc. ("Meridian"), an Illinois corporation with its principal place of business at 2200 North Meacham Road, Suite 400, Schaumburg, Illinois 60173.
By way of brief background on the parties and their commercial relationship: Meridian is Vantage's largest customer and is a Tier-1 automotive supplier specializing in automatic transmission systems, which it supplies to multiple original equipment manufacturers ("OEMs"). Vantage is a Tier-2 manufacturer of precision-machined aluminum and steel components, supplying Meridian with a range of critical drivetrain parts. The commercial relationship between Vantage and Meridian dates back to approximately 2016 and is of substantial value to both parties.
The present dispute arises from Meridian's issuance of three Warranty Chargeback Notices — designated WCN-2021-1247, WCN-2022-0103, and WCN-2022-0289 — under the parties' Long-Term Supply Agreement (Reference No. LTSA-MPT-2020-0315, executed March 15, 2020) (the "LTSA"). In those notices, Meridian alleges that Vantage supplied defective precision-machined aluminum valve body housings (Part Nos. VMS-4400A through VMS-4400F) that caused field failures in Meridian's 8-speed automatic transmission modules (Meridian Model MPT-8AT). The aggregate chargebacks claimed by Meridian total $4,870,550.20 across 11,814 units, representing a significant potential financial exposure for our client.
Vantage contests the validity of these chargebacks and maintains that the field failures are not attributable to defects in its valve body housings. A more detailed summary of the factual background is provided in Section 3 below for your reference as you undertake the engagement.
In light of this dispute, Calderwood & Harkness, on behalf of Vantage, hereby retains Apex Metallurgical Consulting, Inc. to perform an independent failure analysis of the returned valve body housings that are the subject of the chargeback notices. The engagement is assigned Calderwood & Harkness Matter No. 1007-00005, which should be referenced on all correspondence and invoices related to this matter.
The primary contact at Calderwood & Harkness for this engagement is Carlos Espinoza, Lead Associate, Litigation (General). Mr. Espinoza may be reached at (312) 555-7438 or cespinoza@calderwoodharkness.com. The responsible partner for this matter is Samuel Eklund, who may be reached at (312) 555-7412 or seklund@calderwoodharkness.com. All substantive communications regarding this engagement should be directed to Mr. Espinoza or Mr. Eklund as set forth more fully below.
2. Attorney-Client Privilege and Work-Product Protection
The protections described in this Section are of critical importance to the engagement and must be carefully observed at all times.
Apex's retention is made at the express direction of counsel, Calderwood & Harkness LLP, in anticipation of potential litigation between Vantage and Meridian. While no formal litigation or arbitration proceeding has been filed as of the date of this letter, the dispute is such that litigation or arbitration is reasonably anticipated, and this engagement is being structured accordingly to preserve all applicable privileges.
All communications between Apex and Calderwood & Harkness, including but not limited to oral discussions, written correspondence, e-mails, memoranda, and telephone conferences, and all work product generated by Apex in connection with this engagement, including but not limited to reports, draft reports, notes, data, analyses, and opinions, are intended to be protected by the attorney-client privilege and the attorney work-product doctrine as recognized under applicable federal and state law. Apex's work is being performed for the purpose of assisting counsel in rendering legal advice to Vantage and in anticipation of potential litigation, and the protections afforded by these doctrines are essential to the effective representation of our client.
In furtherance of these protections, the following requirements shall apply:
(a) Apex shall not disclose any findings, reports, data, opinions, or communications related to this engagement to any third party — including but not limited to Meridian, Meridian's counsel, any OEM, any other expert or consultant, or any media representative — without the prior written consent of Calderwood & Harkness LLP.
(b) All documents, reports, memoranda, and materials prepared by Apex in connection with this engagement shall be prominently marked with the following designation or a substantially equivalent designation:
"PRIVILEGED AND CONFIDENTIAL — PREPARED AT THE DIRECTION OF COUNSEL — ATTORNEY WORK PRODUCT"
(c) Apex shall direct all communications regarding the engagement exclusively to Carlos Espinoza or Samuel Eklund at Calderwood & Harkness LLP. Apex shall not communicate directly with any Vantage personnel — including but not limited to Vantage's VP of Quality, Thomas Reinhardt, or any other Vantage engineer, quality inspector, or management-level employee — unless specifically directed to do so by Calderwood & Harkness in writing. This restriction is essential to maintaining the integrity of the privilege.
(d) Apex acknowledges and agrees that it is Calderwood & Harkness LLP, not Vantage directly, that is directing the scope, methodology, and priorities of the work performed under this engagement. While Vantage is the ultimate client and payor, the engagement is structured as a retention by counsel for purposes of privilege preservation. Apex shall take direction from Calderwood & Harkness on all matters relating to the scope and conduct of the engagement.
We emphasize that the inadvertent disclosure of privileged information could result in a waiver of the privilege, with potentially significant adverse consequences for our client's legal position. Apex and all Apex personnel performing work under this engagement must exercise the utmost care to avoid any such disclosure.
3. Background Summary for Expert's Reference
The following background summary is provided for Apex's reference in connection with the engagement. This summary is based on information currently available to Calderwood & Harkness and is subject to supplementation as additional facts are developed. This summary is itself privileged and confidential and should be treated accordingly.
3.1 The Supply Relationship
Vantage and Meridian have maintained a commercial supply relationship since approximately 2016. During that time, Vantage has supplied range precision-machined aluminum and steel components to Meridian for incorporation into Meridian's transmission systems.
The current governing contract between the parties is the Long-Term Supply Agreement, Reference No. LTSA-MPT-2020-0315, executed March 15, 2020, with a five-year term running through March 14, 2025 (the "LTSA"). Under the LTSA, Vantage supplies precision-machined aluminum valve body housings — specifically, Part Numbers VMS-4400A through VMS-4400F — to Meridian's assembly plant located in Schaumburg, Illinois. These six part numbers represent variants of the same core component, differentiated by minor machining features that correspond to different transmission configurations.
Annual production volumes under the LTSA are approximately 480,000 units at a weighted average unit price of $78.50, representing annual revenues to Vantage of approximately $37.68 million. This makes the Meridian program one of Vantage's most significant revenue streams and underscores the commercial significance of the dispute.
The valve body housings supplied by Vantage are integrated into Meridian's 8-speed automatic transmission modules (Meridian Model MPT-8AT). The MPT-8AT is supplied by Meridian to three OEM customers (the identities of which are subject to Meridian's confidentiality restrictions but are known to counsel). The valve body housing is a critical structural and hydraulic component of the transmission, serving as the mounting platform for the solenoid pack and providing the internal fluid passages that control shift actuation.
3.2 The Alleged Defect
Beginning in or around October 2021, Meridian's OEM customers began reporting transmission solenoid-circuit malfunctions in vehicles equipped with MPT-8AT transmissions. The reported symptoms included erratic shift behavior, delayed engagements, and, in certain cases, activation of the transmission's "limp-mode" — a protective operating mode that limits the transmission to a single gear ratio to prevent further damage.
Meridian has asserted that the root cause of these field failures is micro-porosity in the valve body housings supplied by Vantage. Specifically, Meridian claims that porosity in the aluminum casting — particularly in the regions surrounding the solenoid bores — allowed hydraulic fluid to bypass intended fluid passages, resulting in pressure losses within the solenoid circuits. According to Meridian, this pressure loss led to the erratic shift behavior and limp-mode activations reported by the OEMs.
The applicable engineering specification governing the manufacture of the valve body housings is Meridian Engineering Drawing Set MER-DWG-4400, Revision C ("Rev. C"). Rev. C specifies a maximum porosity threshold of ASTM E505 Level 2. Meridian contends that a significant number of the returned units exhibit porosity exceeding this Level 2 threshold and that this excess porosity is the proximate cause of the field failures.
It should be noted that ASTM E505 (Standard Reference Radiographs for Inspection of Aluminum and Magnesium Die Castings) establishes a grading system for porosity in cast aluminum components based on reference radiographs, with Level 1 representing the least porosity and Level 4 representing the most. A Level 2 maximum threshold is a moderately stringent specification that is common in precision hydraulic applications.
3.3 Vantage's Position
Vantage vigorously contests Meridian's allegations and contends that its valve body housings were manufactured in full conformity with the requirements of MER-DWG-4400, Rev. C, including the ASTM E505 Level 2 maximum porosity threshold.
In support of its position, Vantage points to its extensive internal quality records, including its Production Part Approval Process ("PPAP") documentation and its ongoing Statistical Process Control ("SPC") data for Part Nos. VMS-4400A through VMS-4400F. According to Vantage's quality records, 97.3% of sampled parts met ASTM E505 Level 1 (the most stringent level), and 100% of sampled parts met ASTM E505 Level 2 (the contractually specified threshold). These quality records span the relevant production periods and represent a statistically significant sample of output.
Critically, Vantage has identified an alternative potential cause for the field failures. Vantage's Vice President of Quality, Thomas Reinhardt, has identified that Meridian implemented a change to its torque-wrench calibration protocol in August 2021 — approximately two months before the first OEM field-failure reports emerged in October 2021. Vantage believes, and intends to demonstrate through the analysis performed under this engagement, that the field failures may be attributable, in whole or in part, to inadequate torque on the solenoid-pack retaining bolts during Meridian's final assembly process at its Schaumburg facility.
The applicable torque specification for the solenoid-pack retaining bolts is 12 Nm (Newton-meters), as set forth in Meridian's own assembly work instructions. If the retaining bolts were insufficiently torqued — for example, due to improperly calibrated torque wrenches — the solenoid pack could fail to seal properly against the valve body surface, allowing fluid leakage at the gasket interface. Such a leakage pattern would produce symptoms substantially identical to those caused by casting porosity, including pressure losses, erratic shift behavior, and limp-mode activation. The temporal correlation between the calibration protocol change and the onset of field failures is, in Vantage's view, significant.
3.4 The Chargeback Notices
Meridian has issued three Warranty Chargeback Notices under the LTSA, each claiming reimbursement for costs associated with field failures allegedly caused by Vantage's valve body housings. The notices are summarized as follows:
The per-unit chargeback amount of $412.30 is computed by Meridian as follows:
Vantage has raised a number of objections to the chargeback notices, including challenges to the per-unit cost calculations, the failure-analysis methodology employed by Meridian, and Meridian's compliance with the notice and inspection provisions of the LTSA. Of particular relevance to this engagement, Vantage has noted that the returned parts from the first chargeback notice (WCN-2021-1247) were not made available for Vantage's inspection until 52 days after the notice was issued, and that 2,108 of the 3,842 units referenced in that first notice were never tendered for inspection at all. These chain-of-custody issues may bear on the evidentiary weight of any analysis of those particular units.
4. Scope of Work
The scope of work for this engagement encompasses the tasks described in Sections 4.1 through 4.6 below. Apex shall perform all work in accordance with generally accepted metallurgical engineering standards and practices and in a manner consistent with the independence and objectivity requirements set forth in Section 10 of this letter.
4.1 Metallurgical Examination of Returned Parts
Apex shall perform a comprehensive metallurgical examination of returned valve body housings (Part Nos. VMS-4400A through VMS-4400F) provided by Meridian and/or made available through counsel. The examination shall be conducted at Apex's laboratory facility in Ann Arbor, Michigan, or at such other location as may be mutually agreed upon by the parties.
The examination techniques employed by Apex shall include, at a minimum, the following:
(a) Visual inspection of each returned unit, including documentation of external surface condition, visible defects, damage, corrosion, contamination, and any evidence of prior disassembly, handling, or testing by Meridian or its agents;
(b) Dimensional measurement of critical features, including solenoid bore diameters, gasket sealing surfaces, and bolt-hole locations, to verify conformance with MER-DWG-4400, Rev. C, tolerances;
(c) Optical microscopy of metallurgical cross-sections, including examination of microstructure, grain size, and porosity characteristics at appropriate magnifications;
(d) Scanning electron microscopy ("SEM"), including energy-dispersive X-ray spectroscopy ("EDS") where appropriate, for high-resolution imaging and compositional analysis of porosity sites, fracture surfaces, and other areas of interest; and
(e) Any other non-destructive and destructive testing methods deemed appropriate by Dr. Vorhaus in the exercise of his professional judgment, including but not limited to radiographic examination, dye penetrant testing, hardness testing, and chemical composition analysis.
The sample set for examination will consist of returned units made available through Calderwood & Harkness's coordination with opposing counsel, Pratt, Givens & Lowell LLP (Rachel Drummond, Partner; Victor Saldana, Associate; 155 North Michigan Avenue, Suite 2700, Chicago, Illinois 60601). Calderwood & Harkness will arrange for the physical custody and transfer of the sample parts and will prepare and maintain appropriate chain-of-custody documentation to ensure the evidentiary integrity of all examined specimens. Apex shall maintain its own chain-of-custody log for all parts received, examined, and returned.
4.2 Porosity Assessment per ASTM E505
Apex shall evaluate each examined unit for porosity in accordance with ASTM E505 (Standard Reference Radiographs for Inspection of Aluminum and Magnesium Die Castings), with specific attention to whether porosity levels in the examined units exceed ASTM E505 Level 2, which is the maximum threshold specified in Meridian Engineering Drawing Set MER-DWG-4400, Rev. C.
The porosity assessment shall include localized porosity analysis, with particular focus on the regions surrounding the solenoid bores, which Meridian has identified as the critical failure zone. This localized analysis is important because overall porosity levels in a casting may meet specification while localized concentrations of porosity in hydraulically sensitive areas may nonetheless exceed acceptable limits.
Apex shall categorize each examined unit by ASTM E505 level and shall thoroughly document the location, size, morphology, and distribution of any porosity observed. Where destructive testing is performed (e.g., metallurgical cross-sectioning), Apex shall document the precise location and orientation of each section relative to the overall part geometry. Photographic and micrographic documentation of all significant findings shall be maintained and included in the written report.
4.3 Evaluation of Assembly-Related Failure Modes (Torque Evidence)
In addition to the porosity assessment, Apex shall examine each returned unit for physical evidence of assembly-related failure modes, with specific emphasis on evidence relating to the torque applied to the solenoid-pack retaining bolts during Meridian's final assembly process.
This analysis shall include, at a minimum:
(a) Examination of bolt-head witness marks on the valve body housing surface surrounding each bolt hole, including measurement and characterization of any impressions, deformation, or scoring indicative of bolt-tightening forces;
(b) Examination of gasket compression patterns on the solenoid-pack sealing surfaces, including assessment of whether the compression pattern is consistent with uniform application of the specified 12 Nm torque across all retaining bolts, or whether the pattern indicates non-uniform or insufficient clamping force;
(c) Examination of any thread damage, galling, or deformation in the bolt holes that may indicate improper fastener installation or removal;
(d) Assessment of any other physical indicia bearing on whether the solenoid-pack retaining bolts were tightened to Meridian's specified 12 Nm torque value, including but not limited to any marks or evidence left by torque-wrench engagement and any evidence of bolt re-use or replacement; and
(e) Documentation of each examined unit's overall condition at the bolt-hole and gasket-surface locations, with specific attention to distinguishing between manufacturing-related characteristics and assembly-related characteristics.
Apex shall assess whether the observed failure modes on each examined unit are consistent with insufficient bolt torque, casting porosity, or a combination of both factors, and shall document the basis for each such assessment.
4.4 Causation Analysis
Drawing upon the findings from the metallurgical examination (Section 4.1), porosity assessment (Section 4.2), and assembly-related failure mode evaluation (Section 4.3), Apex shall provide a professional engineering opinion as to the most probable root cause(s) of the field failures reported in connection with the MPT-8AT transmission. Specifically, Apex shall opine on whether the field failures are attributable to:
(a) Porosity in Vantage's aluminum valve body housing castings exceeding the ASTM E505 Level 2 specification;
(b) Insufficient torque applied to the solenoid-pack retaining bolts during Meridian's final assembly process;
(c) A combination of casting porosity and insufficient assembly torque acting in concert to produce the observed failures; or
(d) Other causes identified through Apex's analysis, including but not limited to material-composition anomalies, design deficiencies, service-environment factors, or improper repair or handling of returned units.
The causation analysis should address causation on a per-unit basis for each examined sample, providing a determination (or, where appropriate, a range of probable causes) for each individual unit. In addition, Apex shall provide aggregate statistical conclusions where the sample size and data quality permit, including any statistically significant correlations between porosity levels, assembly-torque evidence, production lot or date codes, and failure mode.
Apex shall specifically consider and address Meridian's August 2021 torque-wrench calibration protocol change as a potential contributing factor to the field failures, to the extent that the physical evidence permits such an assessment. Calderwood & Harkness will provide Apex with such information regarding the nature and timing of the calibration change as is available.
4.5 Preparation of Written Report
Apex shall prepare a detailed written report of its findings, methodology, data, and opinions (the "Report"). The Report shall be comprehensive and shall set forth, in sufficient detail to be understood by both technical and non-technical audiences, the following:
(a) A description of all examination techniques and methodologies employed;
(b) A description of each sample examined, including identification by part number, serial number or lot number (where available), and chargeback notice reference;
(c) All factual findings resulting from the metallurgical examination, porosity assessment, and assembly-related failure mode evaluation;
(d) Photographic and micrographic documentation of all significant findings, including annotated images where appropriate;
(e) Data tables summarizing porosity levels, dimensional measurements, and other quantitative findings for each examined unit and in aggregate;
(f) Any supporting analytical data, including SEM images, EDS spectra, and radiographic images;
(g) Apex's professional engineering opinions as to the most probable root cause(s) of the field failures, stated with the degree of certainty customary in the metallurgical engineering discipline; and
(h) A statement of Dr. Vorhaus's qualifications and relevant experience.
The Report shall be suitable for use in potential litigation or arbitration proceedings, including as the foundation for expert testimony, should such proceedings become necessary. The Report shall comply with the requirements of Federal Rule of Civil Procedure 26(a)(2)(B) to the extent applicable, in the event the dispute proceeds to federal litigation.
A preliminary report of findings is expected within approximately five (5) weeks of receipt of all sample parts for examination. Calderwood & Harkness and Apex will confer regarding the timeline as the engagement proceeds and will make adjustments as necessary based on the volume and condition of the sample set.
The Report, and all drafts thereof, shall be directed exclusively to Calderwood & Harkness LLP and shall be marked "PRIVILEGED AND CONFIDENTIAL — PREPARED AT THE DIRECTION OF COUNSEL — ATTORNEY WORK PRODUCT" in accordance with Section 2 of this letter.
4.6 Additional Services
If requested by Calderwood & Harkness, Apex may be asked to provide services beyond the initial scope of work described in Sections 4.1 through 4.5, including but not limited to:
(a) Supplemental analysis of additional returned units or additional testing on previously examined units;
(b) Preparation of rebuttal opinions in response to Meridian's failure-analysis data, reports, or expert opinions;
(c) Assistance with the preparation of demonstrative exhibits, tutorials, or visual aids for use in litigation or arbitration; and
(d) Expert testimony, whether by deposition, at trial, or in arbitration proceedings, including preparation for such testimony.
Any such additional services will be subject to the fee structure set forth in Section 6 below and will require prior written authorization from Calderwood & Harkness before work commences. Calderwood & Harkness will endeavor to provide Apex with reasonable advance notice of any anticipated additional-services requests.
5. Materials to Be Provided
Calderwood & Harkness will arrange for the following materials to be provided to Apex in connection with the engagement:
(a) Returned valve body housings — the physical sample set of returned units, to be coordinated through Calderwood & Harkness's discussions with opposing counsel and made available for examination in accordance with an agreed-upon inspection protocol and chain-of-custody procedures;
(b) Meridian Engineering Drawing Set MER-DWG-4400, Rev. C — the applicable engineering specification for the valve body housings, including dimensional tolerances, material specifications, and the ASTM E505 Level 2 porosity requirement;
(c) LTSA-MPT-2020-0315 — relevant excerpts of the Long-Term Supply Agreement between Vantage and Meridian, including but not limited to the warranty provisions set forth in Section 9 of the LTSA and the inspection and acceptance provisions;
(d) Vantage's PPAP documentation and ongoing SPC data for Part Nos. VMS-4400A through VMS-4400F, covering the production periods relevant to the chargeback notices;
(e) Meridian's Warranty Chargeback Notices — WCN-2021-1247, WCN-2022-0103, and WCN-2022-0289, including any attached exhibits, unit listings, or supporting documentation;
(f) Meridian's internal failure-analysis reports, to the extent such reports are obtained through the parties' informal document exchanges or, if litigation is commenced, through formal discovery;
(g) Information regarding Meridian's torque-wrench calibration protocol and the August 2021 change, as available through Calderwood & Harkness's investigation or through the discovery process; and
(h) Any additional documents or materials as necessary to support Apex's analysis, to be provided on a rolling basis as they become available.
Calderwood & Harkness will provide Apex with a transmittal letter or index accompanying each production of materials, and Apex shall maintain a log of all materials received. All materials provided to Apex remain the property of Calderwood & Harkness (or its client) and are subject to the confidentiality and return-of-materials provisions of this letter.
6. Fee Structure and Budget
6.1 Hourly Rates
Apex's services under this engagement shall be compensated on an hourly basis at the following rates:
These hourly rates shall apply to all work performed in connection with the engagement, including but not limited to examination and testing, data analysis, report preparation, communications with counsel, and travel time (billed at 50% of the applicable hourly rate). Should Apex propose to engage any additional personnel not encompassed by the categories above, Apex shall notify Calderwood & Harkness in advance and obtain approval for the applicable billing rate.
6.2 Estimated Budget
The estimated total budget for the initial scope of work described in Section 4 (Sections 4.1 through 4.5) is approximately $95,000. This estimate is based on the currently anticipated scope and volume of returned parts to be examined and assumes a sample set consistent with the units expected to be made available through the chargeback notice process.
The estimate is broken down approximately as follows:
This estimate is provided for planning purposes and is subject to adjustment based on the actual volume of parts examined, the complexity of the findings, and the extent of supplemental testing required. Apex will notify Calderwood & Harkness promptly if, at any point during the engagement, the actual scope of work is expected to exceed the estimated budget. Any material deviation from the budget — defined as a deviation greater than ten percent (10%) of the estimated total — will require prior written approval from Calderwood & Harkness before additional work is performed.
6.3 Invoicing and Payment
Apex shall submit monthly invoices to Calderwood & Harkness LLP, addressed to Carlos Espinoza, Lead Associate, Litigation (General), and referencing Matter No. 1007-00005. Invoices shall be submitted in writing (electronic submission by e-mail to cespinoza@calderwoodharkness.com is acceptable) and shall include a reasonable description of services performed during the billing period, hours expended by each personnel category, and an itemization of any out-of-pocket expenses incurred.
Invoices shall contain sufficient detail to permit Calderwood & Harkness to review and approve the charges but shall not include privileged or work-product-protected information in such detail as to risk disclosure of the substance of legal strategy. Calderwood & Harkness will provide guidance on appropriate invoice descriptions if needed.
Payment terms are net thirty (30) days from Calderwood & Harkness's receipt of a properly submitted invoice. Calderwood & Harkness LLP will be the party responsible for payment of Apex's fees and expenses; however, the parties acknowledge that Vantage Mobility Systems Corp. is the ultimate payor and that Calderwood & Harkness's ability to make timely payment is dependent upon receipt of funds from Vantage.
6.4 Expenses.  Reasonable out-of-pocket expenses incurred by Apex in connection with the engagement shall be reimbursable at cost, without markup. Reimbursable expenses include, but are not limited to, the following:
(a) Travel expenses (airfare, ground transportation, lodging, and meals), incurred in connection with site visits, inspection activities, or meetings with counsel, at rates consistent with reasonable business practices;
(b) Shipping and handling costs for the transport of sample parts and materials;
(c) Laboratory consumables, including but not limited to mounting materials, polishing compounds, etchants, and SEM-related consumables; and
(d) Costs of specialized testing subcontracted to third-party laboratories (e.g., independent radiographic testing facilities or chemical analysis laboratories), where such subcontracting is deemed necessary by Apex and approved in advance by Calderwood & Harkness.
Prior approval from Calderwood & Harkness is required for any single expense item exceeding $1,000.00. Apex shall obtain such approval in writing (e-mail is sufficient) before incurring the expense. All expenses shall be documented with receipts or other supporting documentation and included in the monthly invoices described in Section 6.3.
7. Term and Termination
The engagement shall commence on the date of Apex's countersignature of this letter and shall continue until the scope of work described herein is completed or the engagement is terminated in accordance with this Section.
Either party may terminate the engagement upon fifteen (15) days' prior written notice to the other party. Termination by Calderwood & Harkness shall be without prejudice to Apex's right to compensation for work performed and expenses properly incurred through the effective date of termination. Termination by Apex shall be subject to Apex's professional obligation to avoid prejudice to the client's interests by providing reasonable transition assistance.
In the event of termination, whether by either party or upon completion of the engagement, Apex shall:
(a) Promptly return to Calderwood & Harkness all physical materials provided by Calderwood & Harkness in connection with the engagement, including but not limited to sample parts, documents, and other tangible materials;
(b) Deliver to Calderwood & Harkness all work product generated in connection with the engagement, including the Report (or any partially completed draft thereof), all supporting data, analyses, photographs, and other materials; and
(c) Retain no copies of any materials or work product, except as may be required by applicable law, professional licensing standards, or Apex's document-retention policies, in which case Apex shall notify Calderwood & Harkness of the nature and extent of any retained materials and shall continue to maintain such materials in confidence in accordance with the confidentiality provisions of this letter.
8. Confidentiality
Apex shall maintain in strict confidence all information, documents, and materials received from Calderwood & Harkness or any other source in connection with this engagement, as well as all findings, opinions, analyses, and work product generated by Apex in connection with this engagement (collectively, "Confidential Information"). The confidentiality obligations set forth in this Section are in addition to, and not in lieu of, the privilege-protection requirements set forth in Section 2 of this letter.
Apex shall not disclose any Confidential Information to any person or entity other than designated Calderwood & Harkness personnel (currently identified as Carlos Espinoza and Samuel Eklund) without the prior written consent of Calderwood & Harkness. Apex may disclose Confidential Information to its own employees and contractors who have a need to know such information in connection with the engagement, provided that each such individual is made aware of and agrees to comply with the confidentiality obligations set forth in this letter.
Apex shall implement reasonable physical, electronic, and procedural security measures to protect the confidentiality of all Confidential Information, including but not limited to secure storage of physical materials, password protection for electronic files, and restricted access to materials and work product.
The confidentiality obligations set forth in this Section shall survive the termination or completion of the engagement and shall continue in full force and effect indefinitely, or until Calderwood & Harkness provides written notice releasing Apex from such obligations.
9. Conflicts of Interest
Apex represents and warrants that it has conducted a reasonable conflict check and that, as of the date of its countersignature of this letter, Apex has no current engagement, financial interest, or other relationship with Meridian Powertrain Holdings, Inc., Pratt, Givens & Lowell LLP, or any other known party to the dispute that would create a conflict of interest or compromise Apex's independence and objectivity in performing the work described in this letter.
Without limiting the foregoing, Apex represents that neither Dr. Vorhaus nor any Apex employee anticipated to perform work under this engagement has served as a consultant, expert, or advisor to Meridian, to any of Meridian's OEM customers in connection with the MPT-8AT program, or to Pratt, Givens & Lowell LLP, at any time within the past five years.
Apex shall notify Calderwood & Harkness promptly if any conflict of interest or potential conflict of interest arises at any time during the course of the engagement, including but not limited to any new engagement, solicitation, or relationship involving Meridian, its counsel, or any other party with an interest in the dispute. The parties will confer in good faith to determine whether any such conflict can be appropriately managed or whether termination of the engagement is warranted.
10. Independent Expert Obligations
Apex acknowledges that, notwithstanding its retention by counsel for Vantage and the direction it receives from Calderwood & Harkness regarding scope and methodology, Apex's overriding obligation is to provide objective, independent, and scientifically sound opinions based on the evidence examined and the application of accepted metallurgical engineering principles.
Apex's findings and opinions shall not be influenced by the interests, litigation positions, or desired outcomes of any party, including Vantage. If Apex's analysis yields findings that are unfavorable to Vantage's position in the dispute, Apex shall report those findings honestly and completely to Calderwood & Harkness. Calderwood & Harkness will work with Apex to understand the implications of any such findings, but at no time will Calderwood & Harkness request or expect Apex to alter, suppress, or misrepresent its independent professional conclusions.
This commitment to independence and objectivity is essential both to the integrity of the analytical process and to the credibility of Apex's opinions should the matter proceed to litigation or arbitration. Apex's value as an expert depends upon its reputation for impartiality and scientific rigor, and Calderwood & Harkness fully respects and supports that commitment.
11. Insurance
Apex shall maintain professional liability insurance (errors and omissions coverage) in an amount not less than $2,000,000 per occurrence throughout the term of the engagement. Such coverage shall be provided by a carrier rated A- or better by A.M. Best Company. Apex shall provide Calderwood & Harkness with a certificate of insurance evidencing the required coverage upon request and shall notify Calderwood & Harkness promptly if the coverage is cancelled, materially modified, or allowed to lapse during the term of the engagement.
12. Governing Law
This engagement letter, and any disputes arising out of or relating to this letter or the engagement, shall be governed by and construed in accordance with the laws of the State of Illinois, without regard to its choice-of-law or conflict-of-laws principles.
13. Entire Agreement and Amendments
This letter constitutes the entire agreement between Calderwood & Harkness LLP and Apex Metallurgical Consulting, Inc. with respect to the subject matter hereof. It supersedes all prior and contemporaneous discussions, negotiations, understandings, and agreements, whether oral or written, relating to the engagement.
No amendment, modification, or waiver of any provision of this letter shall be effective unless made in writing and signed by authorized representatives of both parties. The failure of either party to enforce any provision of this letter shall not constitute a waiver of that provision or of the right to enforce it at a later time.
14. Counterparts and Acceptance
This letter may be executed in counterparts, including by facsimile or electronic (PDF) transmission, each of which shall be deemed an original and all of which together shall constitute one and the same instrument.
If the foregoing terms are acceptable to Apex, please indicate your acceptance by having Dr. Vorhaus countersign this letter in the space provided below and return one fully executed copy to my attention at Calderwood & Harkness LLP, 200 South Wacker Drive, Suite 3100, Chicago, Illinois 60606, or by electronic transmission to cespinoza@calderwoodharkness.com. We look forward to working with you on this engagement.
Very truly yours,
CALDERWOOD & HARKNESS LLP
By: ________
Carlos Espinoza Lead Associate, Litigation (General) 200 South Wacker Drive, Suite 3100 Chicago, IL 60606 Tel: (312) 555-7438 cespinoza@calderwoodharkness.com
cc: Samuel Eklund, Responsible Partner, Calderwood & Harkness LLP
ACCEPTANCE AND AGREEMENT
The undersigned, on behalf of Apex Metallurgical Consulting, Inc., hereby accepts and agrees to the terms and conditions of the engagement set forth in the foregoing letter dated March 18, 2022, from Calderwood & Harkness LLP.
ACCEPTED AND AGREED:
APEX METALLURGICAL CONSULTING, INC.
By: ________
Name: Dr. Stefan Vorhaus, Ph.D.
Title: Lead Expert / Metallurgical Engineer
Date: ________
Chargeback Notice | Date Issued | Units Claimed | Amount Claimed
WCN-2021-1247 | December 6, 2021 | 3,842 | $1,583,654.60
WCN-2022-0103 | January 18, 2022 | 4,260 | $1,756,398.00
WCN-2022-0289 | February 7, 2022 | 3,712 | $1,530,497.60
Total | 11,814 | $4,870,550.20
Component | Amount
Replacement part cost | $78.50
OEM dealer labor | $218.00
Meridian failure-analysis/logistics | $67.80
Administrative fee | $48.00
Total per unit | $412.30
Personnel Category | Hourly Rate
Dr. Stefan Vorhaus — Lead Expert / Metallurgical Engineer | $475.00
Senior Engineer / Analyst | $325.00
Junior Engineer / Analyst | $225.00
Laboratory Technician | $150.00
Task | Estimated Cost
Metallurgical examination and testing (Sections 4.1–4.3) | $52,000
Causation analysis (Section 4.4) | $18,000
Report preparation (Section 4.5) | $20,000
Laboratory consumables and materials | $5,000
Total estimated budget | $95,000

CALDERWOOD & HARKNESS LLP

ACCEPTANCE AND AGREEMENT

ACCEPTED AND AGREED:

APEX METALLURGICAL CONSULTING, INC.

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