As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED GEAR DISAGREE AND NOSE DOOR WARNING MESSAGE ON TAKEOFF. CREW DECLARED EMERGENCY, DIVERTED AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED, FOUND ICING ON NLG PROXIMITY SENSORS. AFTER REMOVAL OF ICE, MAINTENANCE PERFORMED FUNCTIONAL TEST OF LANDING GEAR EXTENSION AND RETRACTION SYSTEM, RESET PSEU MEMORY IAW AMM. NO RECURRENCE OF FAULT CODES. AIRCRAFT RELEASED FOR SERVICE.