As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 9000, CMH TO YQB. THE CREW REPORTED THAT AFTER TAKEOFF, THE LEFT MAIN LANDING GEAR WOULD NOT RETRACT AND HAD LANDING GEAR LEVER DISAGREE MESSAGE. THE FLIGHT RETURNED TO CMH AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND 2 FAULTY PROX SWITCHES ON THE LEFT GEAR. MAINTENANCE REPLACED ALL FOUR PROX SWITCHES ON THE LEFT GEAR ALONG WITH THE LGEU. THE GEAR WAS SWUNG WITH NO FURTHER DEFECTS NOTED.