As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED ALL HYDRAULIC SYSTEMS INOPERATIVE IN FLIGHT. LANDING GEAR WAS EXTENDED PNEUMATICALLY AND AIRCRAFT LANDED WITHOUT INCIDENT. IT WAS DETERMINED THE HYDRAULIC LOADING VALVE WAS NOT CLOSING ALLOWING HYDRAULIC PRESSURE TO BUILD. THE HYDRAULIC LOADING VALVE WAS REPLACED AND THE AIRCRAFT WAS RETURNED TO SERVICE. (K)