As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) THIS WAS DISCOVER DURING REGULAR 5 YEARS PRESSURE DECAY TEST OF THE HEATER, THE UNIT FAIL TEST. IT WAS REMOVED TO PERFORM ANOTHER TEST. THE LEAK SEEM FROM A CRACK IN THE COMBUSTION CHAMBER INTERCONNECTION BETWEEN INNER & OUTER SECTION. THE FAIL UNIT WAS SEND BACK TO THE MANUFACTURER.