What was found
RIGHT AS THE CENTER TANK WAS EMPTY, IMBALANCE SHOWED ON THE FUEL QTY INDICATOR. NR1 MAIN TANK INDICATED 6.85, NR 2 MAIN INDICATED 8.55. FOLLOWED QRH FOR CROSSFEED, AFTER CROSSFEED WAS COMPLETE NR 1 TANK INDICATIONS DID NOT DECREASE FOR AWHILE. THAN INDICATIONS INCREASED AND THEN DECREASED 200 TO 300 POUNDS. AFTER A WHILE IT SEEMED TO WORK CORRECTLY. ACFT GROUNDED. ACCOMPLISHED GROUND TEST IAW AMM 28-41-00. NO FAULTS FOUND. FQIS SHOWS NO FAULT HISTORY AND THERE IS NO HISTORY FOUND WITHIN THE PAST 30 DAYS. ACCOMPLISHED THE FUEL IMBALANCE CONDITIONAL INSPECTION IAW AMM 05-51-48-211-801.