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 CORROSION WAS FOUND ON UPPER AND LOWER SURFACE OF FLOORBEAM UPPER CHORD AT BS 344 BETWEEN LBL 15 AND RBL 10. MAINTENANCE REMOVED CORRODED UPPER CHORD AT BS 344 FROM LBL 15 TO RBL 40; FABRICATED A NEW REPLACEMENT UPPER CHORD AND 2 EACH ANGLES; INSTALLED REPAIR PARTS IAW B737-300 SRM 53-10-51, FIG 205.