As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 4431 - CREW REPORTED AFTER TAKEOFF LDG AIR/GND FAIL EICAS MESSAGE AND THE LANDING GEAR WILL NOT RETRACT. CREW ELECTED TO DIVERT TO ALB. AIRCRAFT REMOVED FROM SERVICE. REMOVED AND REPLACED NOSE LANDING GEAR AIR/GROUND PROX SWITCH PER EMB 140 AMM 32-63-02. OPERATIONAL CHECK GOOD. AIRCRAFT RETURNED TO SERVICE. (A)