As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) FOLLOWING TAKEOFF, THE LANDING GEAR WOULD NOT RETRACT. THE AIRCRAFT RETURNED FOR A NORMAL LANDING AT THE DEPARTURE AIRPORT MAINTENANCE DETERMINED THAT THE NOSE LANDING GEAR CENTERING ACTUATOR WAS CONTAMINATED WITH MOISTURE. THE ACTUATOR WAS GREASED AND THE MOISTURE WAS REMOVED. THE LANDING GEAR WAS FUNCTION TESTED AND THE AIRCRAFT WAS SUBSEQUENTLY RELEASED FOR SERVICE.