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 AT EXISTING REPAIR IS CORRODED BETWEEN LBL 18 - LBL 50 AT B.S 950C. REMOVED OLD REPAIR AND FABRICATED NEW FROM BAC 1490-2888, ANGLES, AND FILLER. INSTALLED REPAIR, NO OTHER DEFECTS WERE NOTED. ACFT RETURNED TO SERVICE.