As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN FLOORBEAM AT STATION 1681, RBL 10.5 45.50, SEVERAL AREAS UNDERNEATH NUTPLATES HAS CORROSION. R & R THE FLOORBEAM IAW SRM 51-40-02 & IAW DWG NR 146N5091. CAT A MAJOR REPAIR. FOUND CORROSION TO BE OUT OF LIMITS IAW SRM 53-00-51, FIG 101 DETAIL III. MAJOR REPAIR.