As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 3869 - CREW DECLARED EMERGENCY DUE TO MOMENTARY LG AIR GND FAIL MESSAGE WHEN GEAR SELECTED DOWN. AIRCRAFT REMOVED FROM SERVICE. REMOVED AND REPLACED NOSE LANDING GEAR AIR GROUND PROXIMITY SWITCH IAW EMB 145 MM 32-63-02-000-801-A. OPS CHECK GOOD IAW 32-63-00-700-801-A. REMOVED AND REPLACED MAIN LANDING AIR/GROUND PROXIMITY SWITCH IAW 32-63-01-000-801-A. OPERATIONAL CHECK GOOD IAW EMB 145 MM 32-00-02-910-801-A. AIRCRAFT RETURNED TO SERVICE.