As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAINTENANCE WENT TO AIRCRAFT TO DETERMINE A SMOKE SOURCE, NO ECAIS, NO POPPED NEAR CB'S. AIRCRAFT STILL HAD BURNED ODORL OF SMOKE, COMING THROUGH RT FROM AVIONICS UPPER COOLING YAW FAN. FOUND UPPER YAW INDICATOR SWITCH TO BE STICKING. A NEW SWITCH WAS INSTALLED.