As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED WHILE RUNNING CABIN HEATER THE HEATER WARNING LIGHT ILLUMINATED, AFTER SWITCHING TO FAN A DISTINCT ODOR WAS SMELLED AND A PASSENGER REPORTED SMOKE IN THE CABIN. MAINTENANCE INSPECTED AND MADE AN ADJUSTMENT TO THE HEATER CYCLE SWITCH, RAN THE HEATER FOR AN EXTENDED PERIOD OF TIME WITH NO OTHER DEFECTS NOTED.