As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LCQ - MAJOR REPAIR - DURING C-09 CHECK EXFOLIATION CORROSION WAS FOUND ON NUT PLATES LOWER SIDE OF AFT CARGO COMPARTMENT FLOORBEAM BS 1470, RBL 20. MAINTENANCE REMOVED DAMAGED FLOORBEAM FROM BS 1440 TO BS 1500, RBL 20; FABRICATED A NEW REPLACEMENT FLOORBEAM; INSTALLED REPAIR PART IAW B757-200 SRM 51-70-11 PG 1-7.