As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN PERFORMING ICE TEST IN THE AIR, ICE TEST KNOB IN ALL AFTER 14 SECONDS FUMES WERE DETECTED IN BOTH COCKPIT AND CABIN. TURNED SWITCH BACK TO AUTO AND FUMES DISAPPEARED. PERFORMED ANTI ICING SYSTEM OP TEST IAW AMM 30-00-00, NO FUMES NOTED