What was found
AFT CARGO DOOR CUTOUT, FORWARD LOWER MAIN SILL, BRACKET ASSY HAS CORRODED IN RIGHT SIDE BS 787 - 794.37, S25R. GROUNDED - YES. EVALUATED AFT CARGO FWD LOWER MAIN SILL BRACKET ASSY. FOUND TO BE OUT OF LIMITS DUE TO NO LIMITS GIVEN. REMOVED FWD LOWER MAIN SILL BRACKET ASSY LOCATED AND DRILLED NEW BRACKET P/N:146A8322-11, PO: 1137475.1. INSTALLED NEW FWD LOWER MAIN SILL BRACKET ASSY IAW DWG 146A8320 REV: A, SRM 51-40-02 & SRM 51-40-05.