As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) BURNER CAN CRACKS IN SOUTHWIND COMBUSTION HEATER WITH ONLY 170 HRS SINCE OVERHAUL BY AIRCRAFT HEATING AND ELECTRICAL INC. THIS CAUSED EXHAUST FUMES IN AIRCRAFT CABIN. COMPLETED PRESSURE DECAY TEST ON HEATER WITH FAILED RESULTS. REMOVED HEATER FORM AIRCRAFT AND FOUND 2 CRACKS NEAR END CAP WELD.