What was found
FUEL BALANCED AT TAKEOFF,3 HOURS IN TO FLIGHT GOT FUEL CONFIG LIGHT-RAN QRH TO BALANCE FUEL.2 HOURS AFTER BALANCING FUEL WE HAD A 700 LB FUEL IMBALANCE.LANDED WITH 700 LB IMBALANCE. NIL PREVIOUS FUEL IMBALANCE HISTORY.ON ARRIVAL FOUND FUEL IMBALANCE OF 700 LB BETWEEN LEFT AND RIGHT MAIN TANKS.FIM TASK 28-41 FAULT TREE 854 REV 148 ADHERED.FQIS BITE TEST C/OUT.TEST OK.AS PRECAUTIONARY MEASURE FUEL SUMP DRAIN CARRIED OUT FROM LEFT AND RIGHT MAIN TANKS IAW AMM TASK 12-11-03/301 REV 148.REFUELLING CARRIED OUT.ALL INDICATIONS AND FUEL BALANCE NORMAL.FOUND SATIS.