As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE IN HEAVY MAINTENANCE PERFORMING INSPECTIONS IT WAS NOTED THAT THE CABIN FLOORBEAM UPPER FLANGE IS CORRODED BETWEEN RBL 45- RBL 70 AT B.S 950F. CORROSION WAS OUT OF LIMITS REMOVED DAMAGED FLOORBEAM UPPER CHORD. FABRICATED REPAIR PARTS P/N BAC 1505-100617, BAC 1490-2785, BAC 1490-2685, AND BAC1512-3353, BAC 1512-3396. INSTALLED REPAIR, NO OTHER DEFECTS WERE NOTED. ACFT RETURNED TO SERVICE.