As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TOTAL FUEL AND CENTER TANK FUEL QTY INDICATIONS DISAPPEARRED MULTIPLE TIMES ENROUTE DURING FLIGHT. ACFT GROUNDED. REPLACED FUEL QUANTITY PROCESSOR UNIT WITH SERVICEABLE ONE. ACCOMPLISHED FUEL QTY INDICATION SYSTEM OPS TEST, TEST PASSES NO FAULTS FOUND REF MM 28-41-81-400-801 & 28-41-00-710-801.