What was found
MCN - MAJOR REPAIR - DURING C-16 CHECK HFEC INSPECTION INDICATED A 1/4" CRACK ON BS 178 BULKHEAD WEB, WL 234, RBL 9, AT BUTTON HEAD HILOC FASTENER HOLE. MAINTENANCE REMOVED FASTENER, AND CUTOUT CRACKED AREA OF BULKHEAD WEB AT BS 178, WL 234, RBL 9; PERFORMED A HFEC INSPECTION OF CUTOUT TO VERIFY NO CRACKS EXIST; FABRICATED A FILLER AND REPAIR DOUBLER; AND INSTALLED REPAIR PARTS IAW B737-300 SRM 53-10-08, PG. 265-268, FIG. 209.