As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MCN - MAJOR REPAIR - DURING C-17 CHECK A 1 INCH CRACK WAS FOUND ON LT AFT LAVATORY SUBFLOOR PAN TO AFT PRESSURE BULKHEAD CLOSEOUT WEB (INTERCOSTAL FLOOR SEAL) AT BS 1032, LBL 27.38. MAINTENANCE REMOVED DAMAGED PORTION OF INTERCOSTAL FLOOR SEAL AT BS 1032, LBL 27.38; FABRICATED A REPAIR PLATE; INSTALLED REPAIR PART IAW B737-300 SRM 51-70-13 FIG 1.