What was found
MCN - MAJOR REPAIR - DURING C-12 CHECK MULTIPLE CRACKS (5 EACH) WERE FOUND ON BULKHEAD WEB BS 178 AT RBL 4.7 WL 200.375 - WL 201.5, LBL 4.7 WL 200.375 - WL 201, RBL 6.7 WL 212 - WL 212.675, RBL 4.7 WL 212 - WL 212.375, LBL 6.7 WL 211.75 - WL 212.5. MAINTENANCE CUTOUT DAMAGE ON WEB BS 178 AT RBL 4.7 WL 200.375 - WL 201.5, LBL 4.7 WL 200.375 - WL 201, RBL 6.7 WL 212 - WL 212.675, RBL 4.7 WL 212 - WL 212.375, LBL 6.7 WL 211.75 - WL 212.5; PERFORMED HFEC INSPECTION OF CUTOUT AREAS TO VERIFY NO CRACKS EXIST; FABRICATED A REPAIR DOUBLER, A FILLER, AND 6 EACH SHIMS; INSTALLED REPAIR PARTS IAW B737-300 SRM 53-10-08, FIG. 211, PG. 287-288.