A change request is a document to record an adjustment to project scope, schedule, cost, etc. Changes may include corrective action, preventive action, or defect repair, among others. The engineer is proposing what she believes to be a valid design change which can be further evaluated by the change control board. Although changes may be initiated verbally, they should be recorded in written form and entered into the change management and/or configuration management system. Thus, of the available choices, asking the engineer to create and submit a change request is what the project manager should do next, and is, therefore, the best answer to the question asked.