As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DECENT CREW NOTED CAUTION MESSAGE (FUEL IMBALANCE) WITH 1,000 LBS IN RT WING, CENTER TANK STARTED TO FILL UP AND SAW MAX IMBALANCE OF 1200 LBS WITH 1250 IN CENTER TANK. AIRCRAFT LANDED SAFELY; NO FURTHER INCIDENTWS WERE REPORTED. REMOVED AND REPLACED LT AND RT UPPER AND LOWER CHECK VALVES AND CLAMPS.