As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHL - FLT 126 - EN ROUTE PHL-LGW, CREW NOTED THAT THE CENTER FUEL TANK QUANTITY INDICATION AND THE FUEL TOTALIZER HAD GONE BLANK. FLIGHT RETURNED TO PHL AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED THE LEFT AUXILIARY HARNESS AND NR 2 PROBE, WHICH DID NOT SOLVE THE PROBLEM. THE LEFT AND RIGHT BUSSING PLUGS WERE THEN REPLACED. (M)