As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED THE CABIN HEATER WOULD NOT BLOW AND THERE WAS A STRONG ODOR ASSOCIATED WITH THE HEATER. MAINTENANCE INSPECTED AND FOUND CABIN HEATER SWITCH CONTACTS ARCED. REMOVED AND REPLACED CABIN HEATER SWITCH WITH NEW SWITCH WITH NOT ADDITIONAL DEFECTS NOTED.