As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 3725 - MEM-ATL - THE APU FIRE WARNING CAME ON APPROACH TO ATL. DISCHARGED THE APU IRE BOTTLE, CONTINUED APPROACH, AND LANDED AT ATL WITHOUT ANY FURTHER DIFFICULTIES. DEFERRED APU IAW KHA B727 MEL. THE AIRCRAFT WAS RETURNED TO SERVICE. THE DMI WAS CLEARED LATER BY REPLACING THE APU FIRE WARNING POWER SUPPLY. SYSTEM OPERATIONALLY CHECKED GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE. (M)