As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON GND (TAXI) CENTER FUEL TANK QUANTITY INCREASES SLOWLY 0 TO 12. C/W FQIS BITE IAW AMM 28-41-00. NO DEFECTS NOTED PER MCC REQUEST VERIFIED OP0S OF REFUEL AND DEFUEL VALVES VERIFIED FUEL IS IN FACT MIGRATING INTO CENTER TANK FROM WING TANKS FURTHER T/S REQUIRED.