What was found
ON TAKEOFF, UNABLE TO RETRACT LANDING GEAR, RETURNED TO DEPARTURE, LANDED WITHOUT INCIDENT. REPLACED LANDING GEAR SERVICE VALVE, OPS CHECK OK.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
ON TAKEOFF, UNABLE TO RETRACT LANDING GEAR, RETURNED TO DEPARTURE, LANDED WITHOUT INCIDENT. REPLACED LANDING GEAR SERVICE VALVE, OPS CHECK OK.