As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CENTER TANK FUEL QUANTITY INDICATOR WAS INDICATING INTERMITTENT READINGS AT CRUISE. TOTALIZER IS BLANK. ACFT GROUNDED. REMOVED THE HARNESS 28400003-1 AND REINSTALLED CONNECTOR D11316, AND BUSSING PLUG. PERFORMED FIM 28-41 TASK 814, FQIS BITE TEST NOW PASSES WITH NO FAULTS. AS A PRECAUTION, PERFORMED FUEL QUANTITY INDICATING SYSTEM TEST IAW AMM 28-41-00-730-801. ALL VALVES WERE CORRECT.