As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE EN ROUTE CREW EXPERIENCED SMOKE IN THE COCKPIT. EMERGENCY LANDING WAS DECLARED AND LANDED WITHOUT INCIDENT. IT WAS DETERMINED THAT THE NR 2 EHSI, EFD-84, WAS THE CAUSE OF THE SMOKE. THE EFD-84 WAS REMOVED AND REPLACED WITH A SERVICEABLE UNIT AND SYSTEM OPERATED SATISFACTORY. (M)