What was found
(CAN) AIRCRAFT ENTERED ICING CONDITIONS. CREW REPORTED PITOT HEAT 1 AND 2 CAUTION ILLUMINATED WITH THEIR ASSOCIATED CB TRIPPING. QUICK DESCENT WAS INITIATED. REPORTS OF SMOKE SEEN COMING OUT OF THE AIR-CONDITION VENTS, HOWEVER THERE WAS NO SMELL OF SMOKE. EMERGENCY WAS DECLARED AND AIRCRAFT LANDED AT THE AIRPORT. MAINTENANCE HAVE DONE A COMPREHENSIVE INSPECTION, FOUND NO EVIDENCE OF A FIRE OR BURNT WIRING. ENGINE RUNS ACCOMPLISHED NO SMOKE EVIDENT. OPERATOR BELIEVES DUE TO RAPID DESCENT WITH ACM FUNCTIONING, MOISTURE WAS COMING OUT OF THE VENTS.