As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) WHILE IN CRUISE THERE WAS A PUFF OF SMOKE FROM THE LEFT HAND LOWER EFIS SCREEN THEN THE SCREEN WENT BLANK. THE PILOT MADE A EMERGENCY DESCENT AS PER THE OPERATING MANUAL AND LANDED WITHOUT INCIDENT. THE DISPLAY WAS REPLACED AND CHECKED OK.