What was found
DUCT 1 OVERTEMP YELLOW CAS MESSAGE ILLUMINATED IN FLIGHT WHILE ENTERING ICE CONDITIONS AT 9000 FEET. THERE WAS A SMELL IN CABIN AS WELL AS A TEMP RISE WHEN ANTI-ICE ON. COMPLIED WITH QRH CHKLST & ABLE TO GET CAS MESSAGE OUT. APPLIED POWER. FOUND NO ACTIVE DUCT OVERTEMP CAS.PER MCC AND PREVIOUS TROUBLESHOOTING HISTORY, REMOVED AND REPLACED TEMP SENSOR IAW AMM 21-61-04. OPS CHECK GOOD. REMOVED & REPLACED TEMP MODULATION VALVE IAW AMM 21-61-02. RAN BOTH ENGINES AND PERFORMED OPS & LEAK CHECKS WITH SATISFACTORY RESULT.