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-18 CHECK EXFOLIATION CORROSION WAS FOUND ON UPPER SURFACE OF FLOORBEAM AT BS 967, RBL 18, WL 208. MAINTENANCE REMOVED CORROSION; FABRICATED A STRAP REPAIR; INSTALLED REPAIR PART IAW B737-300 SRM 53-00-51 FIG 203 PG 212-214.