As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER TAKEOFF, THE CREW REPORTED SMOKE IN THE COCKPIT AND DECLARED AN EMERGENCY. THE LANDING WAS UNEVENTFUL.THE MAINTENANCE CREW REPORTED THAT ONE OR BOTH PACKS OVERHEATED AND CAUSED THE SMOKE. THE MAINTENANCE INSPECTED THE ECS SYSTEM AND NOTED NO DEFECT. AIRCRAFT RETURNED TO SERVICE.