As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLIMBOUT RECEIVED GEAR DISAGREE. QRH FOLLOWED, DECLARED EMERGENCY AND RETURNED TO AIRPORT WITH UNEVENTFUL LANDING. MAINTENANCE INSPECTED ACFT AND REPLACED THE MAIN LANDING GEAR SELECTOR VALVE. PERFORMED OPERATIONAL CHECKS PER BOMBARDIER AMM. (S)