The correct answer is: A. Replace the indicated parts, one at a time in the recommended sequence, until the problem is resolved; return unused FRUs to stock.
The maintenance package is a document that provides instructions on how to repair a product. It includes information on the possible causes of problems, the steps to take to diagnose the problem, and the parts that need to be replaced.
When a maintenance package identifies several possible FRUs that will resolve a problem, the technician should replace the indicated parts, one at a time in the recommended sequence. This will help to identify the faulty part and avoid unnecessary replacement of parts.
If the problem is resolved after replacing one of the FRUs, the technician should return the unused FRUs to stock. This will ensure that the parts are available for future repairs.
Option B is incorrect because it recommends replacing all of the indicated FRUs at once. This is not necessary and can be costly.
Option C is incorrect because it recommends replacing the system board first if it is on the list of possible FRUs. This is not always the best course of action, as the system board can be expensive to replace.
Option D is incorrect because it does not provide a specific course of action.