As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB OUT, THE CREW RECEIVED A GEAR DISAGREE MESSAGE AND THE NOSE LANDING GEAR WOULD NOT RETRACT. THE QRH WAS COMPLIED WITH, THE CREW DECLARED AN EMERGENCY AND RETURNED, WHERE IT LANDED SAFELY. MAINTENANCE REMOVED AND REPLACED THE NOSE GEAR UNLOCK ASSEMBLY IAW AMM. OPERATIONAL CHECKS GOOD. AIRCRAFT OK FOR SERVICE. (K)