What was found
TYS - A/C WAS EN ROUTE TO RDU FROM IAD WHEN THE BLEED 1 OVERTEMP IN ICING CONDITIONS, QRH FOLLOWED BLEED 2 OVERTEMP PEGGED TO THE TOP. A/C WAS FERRIED TO TYS WHERE MAINTENANCE REMOVED AND REPLACED THE NR 1 HIGH TEMP THERMOSTAT IAW 36-11-06. REMOVED AND REPLACED THE NR 2 PRECOOLER IAW EMB 145XR AMM 36-11-04. REMOVED AND REPLACED THE NR 2 FAN AIR VALVE IAW EMB 145XR 36-11-03, OPS CHECK GOOD ON ALL REPLACEMENT PARTS AND WAS RELEASED. PARTS INVOLVED (PRECOOLER-PN-145-30609-401/SN 3267) (THERMOSTAT- 816624-9/SN-200212148).