As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INSPECTION TYPE:C U/D RIGHT BS 520 UPPER DECK FLOORBEAM FWD FLANGE 2EA FASTENER HOLE FOUND CORROSION AT RBL 21 & RBL 25. FASTENER HOLE OVERSIZED TO 0.342" AT RBL 21 AND 0.310" AT RBL 25 AS PER SRM 51-30-05 AS PER UPS EO B747-5310-23043 APP D WITHIN THE LIMITATION.