As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING M-CHECK FOUND MAIN CABIN FLOORBEAM UPPER SURFACE CORRODED STA 1661, LBL 5-RBL 24. REMOVED CORROSION FOUND TO BE OUT OF LIMITS FROM LBL 5 TO RBL 23 IAW SRM 53-00-51, PAGE 103, FIG 101, DETAIL V1. CUT OUT DAMAGE AREA AT STA1661 LBL 5 TO RBL 23 IN REF B757-2.