As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 4694 AFTER TAKEOFF THE CREW REPORTED, RECEIVED A LANDING GEAR AIR/GROUND FAIL MESSAGE ON EICAS. THE LANDING GEAR WAS NOT RETRACTED. THE CREW ELECTED TO RETURN TO JFK. THE AIRCRAFT LANDED WITHOUT INCIDENT. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED THE MAIN LANDING FORWARD WEIGHT ON WHEELS PROXIMITY SWITCH IAW EMB 140 AMM 32-63-00. OPERATIONAL CHECK WAS GOOD. ALSO REMOVED BLOCKAGE FROM RIGHT MAIN LANDING AFT PROXIMITY WEIGHT ON WHEELS SWITCH TARGET. THE AIRCRAFT WAS RETURNED TO SERVICE.