As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE, A FUEL IMBALANCE OCCURED BETWEEN 1-4 AND 2-3. MANIPULATION OF FUEL VALVES AND PUMPS DID NOT CORRECT THE PROBLEM. FOUND THE NR 4 MAIN TRANSFER VALVE OPEN. REMOVED AND REPLACED THE NR 4 MAIN TRANSFER VALVE ACTUATOR IAW AMM 28-16-04.