As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LANDING GEAR AIR/GROUND FAIL MESSAGE ON EICAS WHEN GEAR IS LOWERED AND GOES AWAY AFTER 3 TO 5 SECONDS. REPLACED NOSE LANDING GEAR UPLOCK PROX SWITCH, PERFORMED GEAR SWINGS, NO MESSAGE PRESENT IAW EMB 145 AMM 31-61-02. TEST FLT SATISFACTORY. AIRCRAFT RELEASED AND RETURNED TO SERVICE.