What was found
PILOT REPORTS AT FIRST DESTINATION, GEAR HANDLE TO LOWER LANDING GEAR, GEAR DID NOT TRANSIT TO DOWN POSITION, PILOT RETURNED AIRCRAFT TO AIRPORT, MANUALLY LOWERED GEAR TO 3 GREEN, DECLARED EMERGENCY, LANDED WITH OUT FURTHER INCIDENT. DETERMINED HYDRAULIC RESERVOIR REQUIRED SERVICE, SERVICED HYDRAULIC SYSTEM, INSPECTED LANDING GEAR, PERFORMED MULTIPLE EXTENSION AND RETRACTION FUNCTIONAL TESTS. NO FURTHER CORRECTIVE ACTION REQUIRED.