What was found
(CAN) AFTER BOTH ENGINES WERE STARTED CREW NOTICED THAT THE COCKPIT AIR FLOW CHANGED. LOUDER AND FASTER THAN NORMAL. THE SELECTED THE ECS SYNOPTIC PAGE AND NOTICED THE COCKPIT & CABIN & DUCT TEMP WAS INDICATING 98C AND THE PACK WAS, AMBER. A FEW SECONDS LATER AN AMBER, "PACK TEMP HIGH" CAS MESSAGE POSTED TO EICAS FOLLOWED BY AN AMBER "TRIM AIR SUPPLY OVERHEAT", CAS MESSAGE. CABIN & COCKPIT STARTED TO FILL UP WITH SMOKE. CREW SHUTDOWN ENGINES & APU. CREW & PASSENGER EVACUATED ACFT.