As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLE FLIGHT#3848 THE CREW REPORTED THE LEFT MAIN GEAR DID NOT RETRACT AFTER TAKEOFF.THE AIRCRAFT LANDED WITHOUT FURTHER INCIDENT.MAINTENANCE INSPECTED AND REPLACED THE LEFT MAIN GEAR UPLOCK PROXIMITY SWITCHES.OPERATIONAL CHECKS WERE GOOD.THE AIRCRAFT WAS RELEASED FOR SERVICE.