As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
1) APU FIRE WARNING SYSTEM WILL NOT TEST ON PREFLIGHT. 2) DEFERRED APU FIRE WARNING PER MEL 26-11 CAT. "C" DMI #10316 ASSIGNED. PLACARD INSTALLED.3) REF. DMI #10316 APU FIRE WARNING SYSTEM WILL NOT TEST. 4) REMOVED AND REPLACED APU OPERATING POWER UNIT. RELAY OPS CHECK GOOD IAW B727 M/M 26-15-00. THIS CLEARS DMI #10316. PLACARD REMOVED.