During project execution, the project manager reviews the issue log and finds high-priority issues that require external domain experts who are not on the team. What should the project manager do?

The project manager should review the open issues with the issue reporter and issue a change request to hire an external domain expert. This approach ensures that the high-priority issues are addressed by qualified personnel, maintaining project quality and integrity. A change request is necessary to formally introduce new resources and potentially adjust the budget or schedule. Requesting team members to learn new domain knowledge quickly is unrealistic for high-priority issues and could lead to delays or errors. Asking the issue reporter to close the issues without resolution is irresponsible and detrimental to the project. Reducing project scope to avoid the issues is a last resort and should only be considered if other options are unfeasible and after thorough analysis of its impact on project objectives.