As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN CABIN FLOORBEAM AT FS 304.986.5 UPPER T CAP REQUIRES REPLACEMENT DUE CORROSION BEYOND ALLOWABLE LIMITS CUSP TO CUSP. ACFT GROUNDED. REPAIRED MAIN CABIN FLOOR BEAM AT BS 986.5, LBL 50-RBL 50 UPPER T-CAP IAW SRM 53-70-51-2R-4, REPAIR 4. THIS IS A CATEGORY "A" REPAIR, NO FURTHER ACTION REQUIRED.