As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED AFTER LANDING GEAR HANDLE SELECTED TO THE UP POSITION, RECEIVED A GEAR DISAGREE CAS MESSAGE. AIRCRAFT RETURNED TO DAY LANDING WITHOUT INCIDENT. MAINTENANCE FOUND ICE ON THE NOSE GEAR PROXIMITY SENSOR. THE ICE WAS REMOVED AND USING THE AIRCRAFT MAINTENANCE MANUAL, INSPECTIONS AND CHECKS WERE PERFORMED. AIRCRAFT WAS RELEASED FOR SERVICE.