As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EWR---CO 2143, CREW REPORTED, " LANDING GEAR/ GROUND FAILURE MESSAGE ON EICAS WHEN GEAR DOWN IS SELECTED." MAINTENANCE REMOVED AND REPLACED LEFTHAND LANDING GEAR SHOCK ABSORBER PROXIMITY SWITCH, OPS. CHECKED GOOD IAW EMB145 MM #32-63-02. AIRCRAFT RETURNED TO SERVICE.