As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REF TSR711470 L/H FUEL QTY INOP. GROUNDED - YES. REPLACED PROBES TU2 & TU4. REPLACED PROBES TU6, TU7, AND TU8. REMOVED AND REPLACED COMP PROBE IN #1 MAIN FUEL TANK. ALL PROBES REPLACED REF B737-800 AMM 28-41-21. ALL PROBES NOW WITHIN ACCEPTABLE TOLERANCES. #1 FQIS SYSTEM TEST GOOD REF AMM TASK 28-41-00-730-801. FUEL BALANCED FOR DISPATCH.