What was found
MCN - MAJOR REPAIR - DURING C-18 CHECK A .5 INCH CRACK WAS FOUND ON INTERCOSTAL WEB AT BS 277, STR 14 RT. MAINTENANCE REMOVED CRACKED INTERCOSTAL WEB AT BS 277, STR 14 RT; FABRICATED A NEW REPLACEMENT INTERCOSTAL PER DWG 65-45807; INSTALLED REPAIR PART IAW B737-300 SRM 51-40-02, FIG 8 PG 1 AND SRM 51-40-03 FIG 14 PG 38.