According to the PMBOK Guide, 6th edition, section 8.3.3.1, the project manager is responsible for monitoring and controlling the project quality and ensuring that the project deliverables meet the quality requirements. The project manager should also document any quality issues or defects that are identified during the quality control process and take appropriate actions to correct them. In this scenario, the project manager should first update the issue log, identify the involved stakeholders, and assign resources to the corrective actions. This will help to track and resolve the quality issue and prevent further deviations or rework. The other options are either premature or irrelevant, as they do not address the root cause of the problem or respect the authority and scope of the project manager. References: PMBOK Guide, 6th edition, section 8.3.3.1, page 287.