As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 5384, STL TO JAX - CREW RECEIVED A LANDING GEAR AIR/GROUND FAIL MESSAGE WHEN GEAR WAS EXTENDED ON FINAL APPROACH. THE AIRCRAFT LANDED WITHOUT INCIDENT. THE LANDING GEAR PROXIMITY SWITCHES WERE CLEANED AND THE SYSTEM WAS RESET AND OPS CHECKED GOOD IAW AMM 32-63-00.