What was found
WHILE IN FOR C-CHECK, MAINTENANCE REPORTED STA 351 LT SIDE 2 INCHES AFT OF FWD AIR STAIR CUTOUT AT STR 18L, FRAME HAS LARGE AREA OF CORROSION AND LARGE CRACK. REMOVED DAMAGED AREA PER SRM 51-40-2, FABRICATED PARTS AND INSTALLED PER SRM 51-40-2. INSTALLED ATTACHING PARTS PER SRM 51-30-2.