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 BS 340 FLOORBEAM UPPER CHORD FWD AND AFT FLANGE FOUND 8EA FLOOR PANEL ATT HOLE CRACKED. CRACK LENGTH 0.063 INCH. U/D BS 340 RBL 36 TO LHS MOST O/B FLOORBEAM UPPER CHORD REPAIRED AS PER RS R53-15-35489 AND UPS EO B747-5310-24401-A.