As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE IN FLT, PITOT INOP LIGHT CAME ON. SWITCH WAS ROTATED TO ALL POSITIONS AND ALL HEATERS WERE WORKING. SHORTLY THERE AFTER SMOKE STARTED COMING OUT FROM BEHIND THE METER SEL AND HEAT CONTROL PANEL. SWITCH WAS IMMEDIATLY TURNED OFF AND A/C RETURNED TO MIA.