As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAINTENANCE NOTED THAT WHEN BATTERIES WERE TURNED ON THAT THE HYDRAULIC PUMP STARTED TO CYCLE EVERY 10-15 SECONDS. FURTHER TROUBLESHOOTING REVEALED THAT THE LANDING GEAR CONTROL VALVE HAD FAILED INTERNALLY. THE VALVE WAS REPLACED AND A FUNCTIONAL CHECK OF THE SYSTEM PERFORMED WITH ALL INDICATIONS NORMAL AND NO LEAKS NOTED. (Z)