As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DEPARTING, THE CREW OBSERVED A FAIL TO RETRACT INDICATION ON THE NLG. THE ACFT RETURNED TO POINT OF DEPARTURE AND LANDED WITHOUT FURTHER PROBLEM. MX WAS UNABLE TO CONFIRM THE CAUSE FOR THE MALFUNCTION ALTHOUGH THE CREW REPORTED ENCOUNTERING SLUSH WHILE TAXIING TO POSITION POSSIBLY INDUCING ICE FOULING. THE NOSE GEAR WAS SERVICED A GEAR SWING CARRIED OUT AND THE ACFT RETURNED TO SERVICE.