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 AFT CARGO FLOOR SUPPORT BS 773, LBL 21 TO RBL 21. MAINTENANCE REMOVED CORROSION FROM AFT CARGO FLOOR TEE SPLICE, MATERIAL LOSS OUT OF LIMITS. FABRICATED NEW TEE SPLICE AND INSTALLED REPAIR IAW B737-300 SRM 51-40-02 PG 3-4.