What was found
DURING CLIMBOUT, A FMC MESSAGE ALERT "VERIFY GW AND FUEL" WAS RECEIVED. PERFORMED UNIT, SHOWED FUEL , AND CENTER TANK FUEL INDICATOR WAS ABSENT ON UPPER DISPLAY UNIT. AFTER 2 MINUTES CENTER TANK FUEL SHOWED 30.00 TOTAL FUEL AND CONTINUED TO SHOW ERRONEOUS QTY FOR ABOUT 45 MINUTES AFTER WHICH IT CORRECTED ITSELF. ACFT GROUNDED. FQIS FLIGHT HISTORY SHOWS 2 FAULTS ON LAST FLIGHT LEG: NR 28-41303 TANK UNIT SHORT/FULL AND NR 28-41308 COMPENSATOR DATA BAD. CURRENT STATUS TEST AND GROUND TEST BOTH PASSED, REF FIM 28-41, TASK 801. SUMPED CENTER TANK AND FOUND NO WATER. CLEANED CTR TANK BUSSING PLUG, REF FIM 28-41 TASK 807. MEASURED CAPACITANCE OF COMPENSATOR AND TANK UNITS OF CENTER TANK, ALL VALUES WERE WITHIN LIMITS. NO HISTORY LAST 90 DAYS. OPS TEST OF FQIS NORMAL, REF MM 28-41-00.