As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TYS - A/C WAS EN ROUTE TO BMH FROM ORD WHEN EICAS MESSAGE OF THE TAT 2 INOP. CREW DIVERTED TO TYS WHERE MAINTENANCE REMOVED AND REPLACED THE NR 2 TAT PROBE IAW EMB 145 AM 34-15-03 AND EMB 145 IPC 34-15-02 FIG 20 PAGE 1 AND 2. OPS CHECK GOOD AND WAS RELEASED TO CONTINUE TO BMH.