As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: ON DESCENT, CENTER TANK FILLS AS IF FUEL IS BACK FILLING. CENTER TANK FUEL 280LBS. PUMPS IN NORMAL POSITION FOR FLIGHT. FOUND LEFT CENTER TANK FUEL PUMP CANISTER CHECK VALVE FAILED. REMOVED AND REPLACED LEFT CENTER TANK CANISTER CHECK VALVE 84QM PER AMM 28-21-52.