As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU WILL NOT FIRE TEST. PLACED ON MEL 26-11 CAT-C DMI 11581. REF DMI 11581, APU FIRE WARNING WILL NOT TEST. REMOVED AND REPLACED APU FIRE TEST OPERATING POWER UNIT, AND APU FIRE TEST RELAY, NO HELP IAW BMM 26-15-00. DMI 11581 REMAINS IN EFFECT.