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 50 UPPER DECK FLOORBEAM AFT FLANGE 2EA FASTENER HOLE FOUND CORROSION AT RBL16 AND RBL 27. 0.310" & 0.326" OVERSIZED. FASTENER HOLE OVERSIZED TO 0.326" AT RBL 16 & 0.310" AT RBL 27 AS PER SRM 51-30-05 AS PER UPS EO B747-5310-23043 APP D WITHIN THE LIMITATION.