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 EXFOLIATION CORROSION WAS FOUND ON THE UPPER AND LOWER SURFACE OF THE AFT CARGO THRESHOLD AT BS 794 TO BS 847, RBL 21 TO RBL 28. MAINTENANCE REMOVED AFT CARGO COMPARTMENT THRESHOLD WEB AT BS 794 TO BS 847, RBL 21 TO RBL 28. FABRICATED A NEW THRESHOLD WEB AND INSTALLED REPAIR IAW B737-300 SRM 51-10-02, PG. 15-16.