When faced with a defect and lacking the original engineering team's expertise, the first step a project manager should take is to check the organizational process assets (OPAs). OPAs can include documentation from previous projects, such as historical information, lessons learned, and knowledge bases, which can provide insights or solutions to the defect. This approach aligns with the PMBOKGuide's emphasis on utilizing organizational knowledge repositories to enhance project outcomes.
References: = The PMBOKGuide, which serves as a foundational reference for PMP objectives, supports the use of OPAs to address project challenges1. Additionally, the Professional in Business Analysis Reference Materials suggest leveraging existing documentation and knowledge to manage and rectify defects2.