As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN ATTEMPTING TO RETRACT THE LANDING GEAR, THE CREW RECEIVED A GEAR DISAGREE WARNING. THE QRH WAS FOLLOWED. THE FLIGHT RETURNED TO CLT AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE NOSE GEAR CENTERED NR 2 PROXIMITY SENSOR FAILED. THE SENSOR WAS REPLACED WITH A NEW UNIT AND ADJUSTED. THE LANDING GEAR OPERATIONALLY CHECKED GOOD. THE AIRCRAFT WAS THEN RELEASED FOR SERVICE.