As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MCN - MINOR REPAIR - DURING C-21 CHECK A .5 INCH CRACK WAS FOUND IN INTERCOSTAL AT BS 480, LBL 24. MAINTENANCE REMOVED INTERCOSTAL FROM BS 460 TO BS 480, LBL 24; FABRICATED A NEW REPLACEMENT INTERCOSTAL PER DWG 69-41473; INSTALLED REPAIR PART IAW B737-200 SRM 51-30-02, FIG 11, PG 2-3.