As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD FLT 5986 THE CREW REPORTED A LANDING GEAR AIR/GROUND FAIL MESSAGE DURING GEAR EXTENSION. MAINTENANCE INSPECTED AND PERFORMED FUNCTIONAL CHECKS OF THE WOW PROXIMITY SWITCHES. NO DEFECTS WERE NOTED. THE AIRCRAFT WAS RELEASED FOR SERVICE.