As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RECEIVED FUEL IMBALANCE MESSAGE, ABOUT 7 HRS INTO FLT (MAIN TANKS) TEXT FROM LOGS 5-7: BALANCED AT TAKEOFF. JUST BEFORE CENTER TANK EMPTY. RT MAIN HAD INCREASED 2000 LBS TO ABOUT 65.6. OVER THE NEXT 3 HRS THE RT TANK CONTINUED TO GAIN ON THE IMBALANCE UNTIL BALANCED. REPLACED RT MAIN FUEL TANK FLOAT OPERATED SHUTOFF VALVE.