What was found
THE PILOT REPORTED THAT APPROXIMATELY SIX HOURS INTO THE FLIGHT, EXPERIENCED A FUEL IMBALANCE. FUEL IN RIGHT TANK WAS ABOUT 3800 LBS LOWER THEN LEFT TANK. RIGHT ENGINE BURNING 300 LBS PER HOUR MORE THAN THE LEFT. FOLLOWED THE CHECKLIST, AND REBALANCED FUEL. MAINTENANCE REPORTED THAT THERE WERE NO FUEL FLOW MESSAGES FOUND IAW AMM 71-00-00-700-838-R00, NO ABNORMAL MISMATCH BETWEEN FUEL FLOWS BETWEEN BOTH ENGINES.