As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MDW FLIGHT 2432 THE CREW REPORTED A LANDING GEAR AIR/GROUND FAIL MESSAGE IN FLIGHT. THE AIRCRAFT RETURNED TO MDW AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE INSPECTED AND REPLACED THE NOSE GEAR WOW PROXIMITY SWITCH. OPERATIONAL CHECKS WERE GOOD.