As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, THE CREW RECEIVED A NOSE DOOR OPEN MESSAGE FOLLOWED BY A WARNING GEAR DISAGREE MESSAGE. THE CREW RETURNED TO FIELD AND NO EMERGENCY WAS DECLARED. THE AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE NLG OLEO CTR/EXT SENSOR BRACKET, CHECK GOOD.