What was found
MCN - MAJOR REPAIR - DURING C-17 CHECK, EXFOLIATION CORROSION WAS FOUND ON INTERCOSTAL ATTACH ANGLE AT BS 357, OUTBOARD OF STRINGER 28 LT. MAINTENANCE REMOVED CORRODED INTERCOSTAL ATTACH ANGLE AT BS 357, STR 28 LT; FABRICATED A NEW REPLACEMENT ANGLE; INSTALLED REPAIR PART IAW B737-300 SRM 51-40-02, FIG 8 AND 12.