(a) Required audit. In connection with the audit of the Operator's subsidizable expenses, the Office of the Inspector General, Department of Transportation, shall audit for MARAD the Operator's M&R costs, as necessary, for the determination of final subsidy rates. The Operator shall substantiate those costs recorded on the books of account which have been approved by the Administration.

(b) Notification of audit results. Upon completion of the audit by the Office of Inspector General, the MARAD Office of Financial Approvals shall notify the Operator of the audit results, including any items disallowed and the reasons for such disallowance.