As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MCN - DURING C11 CHECK DISCOVERED THE MAIN CABIN INTERCOSTAL CRACKED, .75 INCHES, AT RT B/S 1320 BELOW STR 13R AT THE NR 3 DOOR STOP. MAINTENANCE REMOVED AND INSTALLED FABRICATED REPLACEMENT INTERCOSTAL AT RT BS 1320, BELOW STR 13R AT THE NR 3 DOOR STOP IAW BOEING 757-200 SRM 51-40-02-0G.