As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HEATER SENT TO REPAIR STATION, FAILED HEATER DECAY TEST. THE COMBUSTION TUBE WAS REPLACED BUT NO INFORMATION ON WHY. WOULD ASSUME IT HAD CRACK OR HOLE TO CAUSE THE FAILED TEST. THIS FAILURE IS A CONCERN BECAUSE THIS IS A CERAMIC COATED TUBE WITH NO APPLICABLE AD AGAINST IT.