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-10 CHECK, INTERGRANULAR CORROSION WAS FOUND ON CABIN FLOORBEAM AT BS 365.25, BETWEEN RBL 28 AND RBL 43. MAINTENANCE REMOVED CORRODED FLOORBEAM UPPER CAP AT BS 365.25 FROM RBL 28 TO RBL 43; FABRICATED A NEW REPLACEMENT SECTION OF FLOORBEAM; INSTALLED REPAIR PART IAW B757-200 SRM 53-00-51, FIG 201.