As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 1616 THE NLG WOULD NOT LOCK UP AFTER TAKEOFF FROM MTO. BOTH MAIN GEAR COMPLETED RETRACTED & LOCKED INTO THE UP POSITION. THE NOSE GEAR WOULD RETRACT BUT WOULD NOT LOCK UP KEEPING THE GEAR DOORS OPEN. THE CREW EXTENDED THE GEAR & RETURNED TO MTO WHERE THE AIRCRAFT LANDED WITHOUT INCIDENT. MX FOUND THE NOSE GEAR RETRACTION ACTUATOR FAULTY WHICH WAS REPLACED. LANDING GEAR CHECKED GOOD ON JACKS. AIRCRAFT WAS RETURNED TO SERVICE.