What was found
CORROSION; AFT CARGO DOORWAY SUB THRESHOLD IB CHORD LWR NUTPLATE RETAINER STRIP BS 847 + 4; RBL 18. FOUND TO BE OUT OF LIMITS DUE TO NO LIMITS IN THE SRM AND REQUIRES REPLACEMENT IAW SRM 51-10-02-0G-0. REMOVED SUB THRESHOLD IB LOWER NUTPLATE RETAINER STRIP IAW SRM 51-40-02-0G-0. LOCATED DRILLED DEBURRED NEW NUTPLATE RETAINER IAW SRM 51-40-05-0G-0, DWG146A0081. INSTALLED NEW NUTPLATE RETAINER IAW SRM 51-40-02-0G-0; DWG 146A0081.