As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED. AFTER TAKEOFF, WITH BOTH CENTER PUMPS ON, NR 1 MAIN TANK FUEL QUANTITY DROPPED 600 POUNDS BELOW NR 2 MAIN TANK. NR 1 CENTER TANK APPEARS TO BE INOPERATIVE. REMOVED AND REPLACED LEFT CENTER FUEL BOOST PUMP OVERRIDE IMPELLER MOTOR ASSEMBLY IAW AMM 28-22-41. LEAK AND OPERATIONAL CHECK GOOD.