What was found
DURING C-18 CHECK, CORROSION WAS FOUND ON STRINGER 27 LEFT AT BS 987. MAINTENANCE REMOVED CORRODED SECTION OF STRINGER 27 LT FROM BS 967 TO BS 1006; FABRICATED A NEW REPLACEMENT STRINGER PER DWG 65-45776; INSTALLED REPAIR PART IAW B737-300 SRM 51-40-02, FIG 3, 4, 7, AND 8.