As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING CURISE FLIGHT, CREW NOTED ELECTRICAL ODOR AND SMOKE IN COCKPIT AREA. THE AIRCRAFT RETURNED TO ORIGINAL DEPARTURE LOCATION. THE DURATION OF THE SMOKE/SMELL WAS VERY BRIEF. MAINTENANCE REPLACED THE AC VOLTMETER INDICATOR WHICH APPEARS TO HAVE SHORTED INTERNALLY. THE UNIT HAS BEEN SENT FOR INVESTIGATION AND A STRIP HAS BEEN REQUESTED FOR FURTHER FOLLOWUP.