What was found
ON FLIGHT 3832 DURING THE APPROACH TO CYZ THE CREW NOTICED A BURNT PLASTIC ODOR SHORTLY AFTER HEARD DISPLAY FAN KICKING ON-OFF THEN DISPLAY COOL, CAUTION MESSAGE. THE CREW SELECTED FLT ALTN ON CONT, - DISPLAY FAN. DISPLAY COOL, CAUTION MESSAGE EXTINGUISHED. BURNT PLASTIC ODOR DISSIPATED AND DID NOT RETURN, UPON LANDING, DISPLAY COOL CONT, CAUTION MESSAGE RETURNED. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED THE PILOTS NR 1 AVIONICS COOLING FAN IAW CRJ-700 AMM 21-24-12. THE OPERATIONAL CHECK WAS GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.