What was found
MCN - C13 CK - "C" - CORROSION FOUND ON STR 27L, BS 947 TO 996, BEYOND SRM LIMITS. FUSELAGE SKIN HAD MINOR CORROSION ON INSIDE SURFACE IN THE LOCATION WHICH WAS REMOVED AND FOUND TO BE WITHIN LIMITS. MAINTENANCE REMOVED DAMAGED SECTION OF STR 27L, FABRICATED AND INSTALLED REPAIR SECTION OF STRINGER AND TREATED THE AREA PER B737 SRM 53-10-3, FIG 1, PG 3 - 10.