As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING AD 04-21-05, THE HEATER FAILED THE PRESSURE DECAY TEST. REMOVED UNIT AND FOUND CRACKS IN END OF COMBUSTION LINER. UNIT WAS REMOVED AND REPLACED WITH OVERHAULED UNIT. UNIT INSTALLED MAY 1998, AND CONTAINED NEW STYLE CERAMIC LINER.