As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD FLT 6112 THE CREW REPORTED A LANDING GEAR AIR/GROUND FAIL MESSAGE AFTER GEAR EXTENSION. MAINTENANCE INSPECTED AND REPLACED THE RIGHT GEAR DOWNLOCK A PROXIMITY SWITCH. OPERATIONAL CHECKS WERE GOOD. THE WARNING INDICATION REOCCURRED ON FLT 5837. MAINTENANCE REPLACED THE LANDING GEAR ELECTRONIC UNIT. OPERATIONAL CHECKS WERE GOOD.