As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING HEAVY MAINTENANCE VISIT (HMV), LEVEL 2 CORROSION WAS FOUND ON THE MAIN CABIN FLOOR BEAM UNDER TAPE AND CLIP NUTS AT BS 344, RBL 14 TO THE L-1 DOOR. REMOVED CORRODED SECTION OF BEAM, FABRICATED AND INSTALLED REPAIR MEMBERS IAW B727 SRM 53-10-08.