As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE TAXING FOR DEPARTURE AT TAOS AIRPORT. THE PILOT EXPERIENCED AN AVIONICS MASTER SWITCH FAILURE. UPON SEEING A SMALL AMOUNT OF SMOKE AT THE UPPER AREA OF THE INSTRUMENT PANEL THE PILOT IMMEDIATELY SHUT DOWN THE AIRCRAFT AND TAXIED BACK TO THE FBO