As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE AC WAS IN FOR HEAVY CHECK FOUND FWD FUSELAGE PAX CABIN FLOOR STRUCTUE, CORROSION FOUND AT ANGLE ATTACH TO CROSSBEAM FR 17 LBL 24" AREA. MX REMOVED AND REPLACED FLOORBEAM ANGLE PN 170-04075-001 AT FR 17 LBL 24" ON CROSS BEAM IAW SRM 51-43-01. SEE NRC # 4000319-2000-0048 FOR WORK PERFORMED. AC RETURNED TO SERVICE.