As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CVG TO IND - WHILE ON APPROACH TO IND, CREW RECEIVED CAUTION MESSAGES "LG AIR/GROUND FAIL" AND "ENG 1/2 REV DISAGREE". THE QRH WAS FOLLOWED AND THE FLIGHT LANDED WITHOUT INCIDENT. UPON LANDING THE MESSAGES WENT AWAY. MAINTENANCE TROUBLESHOT THE AIR GROUND SYSTEM AND FOUND THAT THE RIGHT MAIN LANDING GEAR WEIGHT ON WHEELS PROX SWITCH WAS BAD, AS WELL AS THE NOSE LANDING GEAR WEIGHT ON WHEELS HARNESS WAS BAD AS WELL. AFTER REPLACING THE PROX SWITCH AND NOSE LANDING GEAR WEIGHT ON WHEELS HARNESS THE AIR GROUND AND THRUST REVERSER SYSTEM FUNCTIONED NORMALLY.