What was found
MCN - MAJOR REPAIR - DURING C-17 CHECK A 2 INCH CRACK WAS FOUND IN INTERCOSTAL AT BS 342, LBL 46, WL 208. MAINTENANCE REMOVED CRACKED INTERCOSTAL FROM BS 328 TO BS 344, LBL 46; FABRICATED A NEW REPLACEMENT INTERCOSTAL PER DWG 65-45834; INSTALLED REPAIR PART IAW B737-300 SRM 51-40-02, FIG 8 AND 12.