As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW WITNESSED SMOKE IN THE AFT CABIN FROM THE BLOWER MOTOR INTAKE. MECHANIC REMOVED CARGO COMPARTMENT UPPER ACCESS PANEL AND INSPECTED WIRES CONNECTING BOARD PANEL AND AFT BLOWER MOTOR. RAN BLOWER MOTOR ON BATTERY POWER AND NOTICED FAINT ELECTRICAL SMELL. RAN AIRCRAFT AND TURNED BLOWER MOTOR HEATER AND INVERTER IN ORDER. NOTICED INTERMITTENT SMELL FROM BLOWER MOTOR. SUSPECTED FAILURE OF AFT BLOWER MOTOR.