As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PASSENGER COMPARTMENT FLOOR SUPPORT HAS MULTIPLE AREAS OF CORROSION AROUND FASTENER HOLES AT LBL 45 FROM FS 559+112 - 621. ON FURTHER INVESTIGATION, TOP & BOTTOM SIDES OF FLOOR SUPPORT ARE CORRODED, CORROSION FOUND TO BE OUT OF LIMITS OF SRM TR53-27. R & R FLOOR SUPORT IAW REO 601R-53-61-1574, REV B.