As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB-OUT AFTER LANDING GEAR RETRACTION, RECEIVED L/G GEAR NOT UPLOCKED MESSAGE. CYCLED LANDING GEAR HANDLE AND ALL INDICATIONS NORMAL. AIRCRAFT CONTINUED TO DESTINATION AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED NOSE LANDING GEAR PROXIMITY SENSOR 25GA. OPERATIONAL CHECK OK.