A project manager is made aware that there are defects in the parts provided by...

 The project manager should review the procurement contract to understand the terms and conditions related to quality and defects. Then, the project manager should engage in negotiations with the supplier to find a solution that is agreeable to both parties. This approach aligns with the PMBOK guide’s emphasis on procurement management, which includes the processes of planning, conducting, controlling, and closing procurements. It is important to manage procurements effectively to ensure that the project can meet its objectives while maintaining good relationships with suppliers.