As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN PILOT SELECTED GEAR DOWN, INCOMPLETE EXTENSION OCCURRED. ATTEMPTS TO EXTEND THE GEAR MANUALLY ALSO FAILED. GEAR COLLAPSED ON LANDING. Z AN INSPECTION FOUND THAT THE COUPLING BETWEEN THE GEAR MOTOR AND ACTUATOR WAS SEPARATED. THE MOTOR WAS FOUND NOT TO OPERATE ALSO. THE ACTUATOR ASSEMBLY IS 30+ YEARS OLD.