As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING INSPECTION, THE CENTER FUSELAGE I FLOOR STRUCTURE HAT BEAM AT FRAME 23 STATION WAS FOUND CORRODED. MAINTENANCE REPLACED THE CENTER FUSELAGE I FLOOR STRUCTURE HAT BEAM AT FRAME 23. THE NEW PART WAS INSTALLED WITH SOLID RIVETS IN ACCORDANCE WITH SRM 51-40-02.