What was found
DURING CLIMB, FUEL IMBALANCE ILLUMINATED FOR NR 1 FUEL TANK. NR 1 HAD 1000 LBS. LESS THAN NR 2 WITH APPROX 15000 LBS TOTAL. FUEL FLOWS WERE THE SAME. FUEL CROSSFEED WAS CLOSED WITH NR 1 AND NR 2 TANKS ALL PUMPS ON AND NORMAL. NO IMBALANCE ON GROUND. TOTAL USED OK, NO LEAK SUSPECTED. ACFT GROUNDED. C/W CROSSFEED VALVE OPS CHECK IAW AMM 28-22-21-710-801, NO DEFECT NOTED. OPS CHECK ON FUEL INDICATION SYS IAW AMM 28-41-00-710-801, GAGES TESTED NORMALLY. BITE CHECK FQIS NO FAULTS NOTED AND PASS THE GROUND TEST IAW FIM TASK 28-41 TASK 801. NO HISTORY PASS 15 DAYS, OK FOR SERVICE. SEAM C NOTIFIED MARK.