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-16 CHECK A 1" CRACK WAS FOUND ON STIFFENER AT R/H AIR CONDITIONING BAY AFT BULKHEAD JUST ABOVE THE TURBO FAN EXHAUST DUCT. MAINTENANCE REMOVED CRACKED STIFFENER AT R/H AIR CONDITIONING BAY AFT BULKHEAD JUST ABOVE THE TURBO FAN EXHAUST DUCT BS 727; FABRICATED A NEW REPLACEMENT STIFFENER; INSTALLED REPAIR PART IAW B737-300 SRM 51-40-02, PG. 10-11.