As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT REPORT OF UNCOMMANDED TRANSFER OF FUEL INTO NR 4 MAIN FROM NR 4 RESERVE AND INTO NR 3 MAIN FROM NR 4 MAIN TANK. INVESTIGATION REVEALED MISSING SEALANT AT NR 4 RESERVE TANK-J NR 4 MAIN TANK RIB ABOVE NR 4 PYLON AND AT NR 3 TO NR 4 TANK RIB ABOVE NR 3 PYLON. MODIFICATION PER SB 747-54-2159 COMPLETED 3 FLIGHTS PRIOR. REMOVED OLD SEALANT, RESEALED AND LEAK CHECKED OK PER BOEING MAINTENANCE MANUAL 28-11-00.