As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF FROM LEX THE CREW RECEIVED A GEAR DISAGREE WARNING MESSAGE. THEY RAN THE QRH WHICH INSTRUCTED THEM TO LAND AT THE NEAREST SUITABLE AIRPORT. THEY RETURNED THE AIRCRAFT TO LEX WHERE ATC DECLARED AN EMERGENCY FOR THEM AND THE FLIGHT LANDED WITHOUT INCIDENT AND TAXIED TO THE GATE FOR MAINTENANCE. INSPECTED AND FOUND PROXY SYST SENSORS PX21 AND PX22 TO BE OUT OF RIG. RIGGED PROXY SENSORS RIG CHECK GOOD NO DEFECTS NOTED.