As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT WAS EN ROUTE FROM TEB TO BUF 30 MILES OUT FROM BUF, PILOT NOTICED OIL AND CYLINDER TEMPERATURES INCREASING. PILOT NOTICED SMOKE STREAMING FROM LEFT ENGINE. PILOT PROCEEDED TO SHUT ENGINE DOWN, NOTIFY ATC AND LANDED SAFELY AT BUF WITHOUT INCIDENT. MAINTENANCE HAS BEEN NOTIFIED AND INSPECTION IS IN WORK.