As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) GEAR HANDLE DID NOT RETURN TO NEUTRAL WHEN GEAR SELECTED UP & GEAR UNSAFE LIGHT ON. WHEN GEAR SELECTED DOWN DID NOT GET 3 GREEN LIGHTS ON FIRST ATTEMPT, ON SECOND ATTEMPT GOT 3 GREEN LIGHTS & HANDLE DID NOT RETURN TO NEUTRAL. LANDING WAS UNEVENTFUL. MAINTENANCE INSPECTION REVEALED HOW HYDRAULIC FLUID LEVEL CAUSED BY LEAKING O-RING ON R/H HYDRAULIC FILTER CANISTER, O-RING FOUND NICKED WHEN REMOVED AND INSPECTED.