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 BS 1661, LBL 5 TO RBL 24. REMOVED CORROSION ON FLOORBEAM UPPER SURFACE FOUND TO BE OUT OF LIMITS. INSTALLED NEW CHORD, 2(EA) ANGLE. 2EA STRAP IAW SRM 53-00-51 REPAIR 3 FIG 201 PG 201-206 ON BS 1661 LBL 5 TO RBL 24.