As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED SMOKE IN COCKPIT AND MADE AN UNSCHEDULED LANDING SAFELY AT ALTERNATE AIRPORT. UPON INVESTIGATION IT WAS FOUND THAT THE DME HAD INTERNALLY FAILED AND BURNT THE CONNECTOR. THE DME IS NOT TRACKED BY TIME OR CYCLES. SO TIMES ARE UNKNOWN.