As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLE FLIGHT 3750 THE CREW REPORTED THE LANDING GEAR DISAGREE MESSAGE DURING RETRACTION. THE AIRCRAFT RETURNED TO CLEVELAND AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED BOTH LEFT MAIN GEAR UPLOCK PROXIMITY SENSORS. OPERATIONAL CHECKS WERE GOOD. THE AIRCRAFT WAS RELEASED FOR SERVICE.