What was found
DURING C CHECK, AFT SIDE OF BS 1166 FRAME, STR 27 LT TO 28 LT IS CORRODED. REMOVED LOWER ANGLE AND STIFFNER FOR ACCESS AND FOUND CORRODED OUT OF LIMITS IAW B-727 SRM 53-10-1 CUT-OUT DAMAGE ON WEB AND FABRICATED FILLER AND NEW STIFFNER REPAIR DOUBLER IAW B-727 SRM 51-40-2. REMOVED 3 DAMAGED ANGLES AND REPLACED IAW B-727 SRM 53-10-2. AND 51-20-1. PARTS ALODINED AND PRIMED IAW B-727 SRM 51-10-2 AND INSTALLED IAW B-727 SRM 51-30-2.