As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CENTER TANK FUEL GAUGE AT REFUELING STATION DISPLAYS FAIL. INTERMITTENT. GROUNDED - YES. PER B737-800 FIM 28-21 TASK 805 AND TROUBLESHOT DOWN FOR CENTER QUANTITY INDICATOR TO BE REPLACED. REMOVED AND REPLACED CENTER QUANTITY INDICATOR. PERFORMED INSTALL TEST GOOD B737-800 AMM 28-41-61/401.