As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLE FLIGHT#3031 THE CREW REPORTED A LANDING GEAR AIR/GROUND FAIL MESSAGE WHEN THE GEAR WAS LOWERED.THE AIRCRAFT LANDED WITHOUT FURTHER INCIDENT.MAINTENANCE INSPECTED AND REPLACED THE LEFT MAIN GEAR AFT PROXIMITY SWITCH.OPERATIONAL CHECKS WERE GOOD.