Near project close a customer claims some deliverables were not met and starts submitting change requests. What should the project manager do next?

The requirements traceability matrix (RTM) is the definitive tool for verifying that all requirements have been met and delivered. It links requirements from their origin to the deliverables that satisfy them, making it the most direct way to confirm whether the customer's claims are valid. Escalating to the sponsor is premature; the project manager must first gather facts. Revising the scope baseline is inappropriate at project close unless a new, approved change has occurred. The project charter provides high-level project objectives but not the detailed requirements needed to assess specific deliverable fulfillment.