What was found
DURING C-CHECK, CARGO DOOR AFT FRAME CORRODED, LOCAL LEVEL 2 AT NUTPLATE. MAINTENANCE PERFORMED REPAIR OF CARGO DOOR AFT FRAME AT NUTPLATE IAW EC5230-01349 UP TO AND INCLUDING FINAL STEP 2.1,2.7. INSTALLED REPAIR IAW SRM 51-40-02. THE ACFT WAS APPROVED FOR RETURN TO SERVICE.