As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE, WITH CENTER FUEL TANK PUMPS RUNNING, AN INCREASING FUEL IMBALANCE WAS BEING INDICATED. THE LT MAIN QUANTITY CONTINUED TO DEPLETE UNTIL THE CENTER PUMPS WERE TURNED OFF AND THE CENTER TANK WAS EMPTY. R & R THE CENTER TANK BOOST PUMP IAW AMM.