As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 3893 - DEN-ONT - RETURNED TO FIELD AND DECLARED AN EMERGENCY WHEN THE NLG WOULD NOT RETRACT AFTER TAKEOFF. THE CREW RECEIVED A 'GEAR DISAGREE' AND 'NLG DOOR' WARNING MESSAGES. MAINTENANCE IS CURRENTLY TROUBLESHOOTING DISCREPANCY. (M)