Considering your $20$ years of experience as an integrity engineer and your proficiency in risk principles, it is crucial to thoroughly study the relevant codes and standards before undertaking any repairs or maintenance on a plug valve. The objective is to ensure that the proposed repair method aligns with the appropriate requirements. Would you adhere to the manufacturer's proposed schedule? If so$,$ why? If not, what alternative suggestions would you propose to maintain valve efficiency while concurrently reducing maintenance costs?