What was found
ACFT LEFT AIRPORT WITH NR 1 TANK FUEL QTY DEFERRED. UPON ARRIVAL INTO ,CREW REPORTED THAT ON APPROACH THEY GOT THE NR 1 TANK FUEL QTY LOW FAULT. CHECKED NR 1 TANK FUEL LEVEL STICKS AND FOUND ONLY 1200 LBS IN TANK NR 1,14600LBS IN TANK NR 2 AND 9100 LBS IN TANK NR 3.APPROX 40 MINS AFTER ACFT WAS FUELED OVER 2000 LBS OF FUEL MIGRATED FROM NR 1 TANK INTO NR 2 TANK. NR 3 TANK QTY WAS NOT AFFECTED.AFTER COMMUNICATING WITH MOCC IT WAS DETERMINED THAT THE LEAK WILL REQUIRE TANK ENTRY . MOCC R FFC NOTIFIED, SHOULD BE ARRIVING APPROX 1600Z 26MAY10 TRYING TO LOCATE A COMPRESSOR AND A VENDER TO DEFUEL ACFT.