As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CTR TANK & TOTAL FUEL QTY INDICATIONS DISAPPEAR DURING CRUISE FLIGHT. GROUNDED - YES. PERFORMED FQIS BITE REF B737-800 FIM 28-41 TASK 801. ON LEG 1, FOUND FAULTS 28-41310 AND 28-41309 PROCESSOR FAULT AND PROCESSOR FAILED. SAME FAULTS WERE FOUND ON LEG 2. REMOVED AND REPLACED FUEL QUANTITY PROCESSOR UNIT REF B737-800 AMM 28-41-81. PERFORMED OPERATIONAL TEST. TEST PASSED.