As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TYS - AIRCRAFT WAS EN ROUTE TO IAH FROM EWR WITH A STOP AT TYS, WHEN LEAVING TYS THE LDG WOULDN'T RETRACT SO CREW RETURN TO BASE. MAINTENANCE REMOVED AND REPLACED THE NLG PROX SWITCH IAW EMB 145 AMM 32-63-02 AND OPS CHECK GOOD. RELEASED BACK TO SERVICE.