As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CROSS FEED FROM CENTER WING AND NR 2 AND NR 3 MAIN TANKS, ALL CROSS FEED VALVES OPEN AND NR 1 AND NR 4 TANKS BOOST PUMP OFF. NR 1 MAIN TANK QTY INCREASES 1000 KGS PER HOUR. REPLACED CHECK VALVE AT AFT BOOST PUMP NR 1. VERIFIED OPERATION OF DISCHARGE CHECK VALVE OK PER MM 28-22-06. TRANSFERRED FUEL INTO NR 1 MAIN LEAK CHECKED AND SYSTEM OPS OK.