What was found
THE COMBUSTION HEATER WAS PRESSURE DECAY CHECKED DURING PRE-PURCHASE EVALUATION. ALTHOUGH NOT REQUIRED BY AD 96-20-07, THE MANUFACTURER RECOMMENDS A PRESSURE DECAY CHECK AT 500 HOURS INITIAL AND 100-HOUR REPETITIVE INTERVALS. THE HEATER FAILED THE PRESSURE CHECK AND THE UNIT WAS REMOVED FOR A BENCH CHECK. FURTHER INVESTIATION REVEALED A CRACK WELD AT THE COMBUSTION HEAD RETAINING FLANGE. THE UNIT WAS REPLACED.