As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DESCENT DFW THE APU DET INOP LIGHT ON FIRE PANEL ILLUM. FOLLOWED POM PROCEDURE. APU AND APU BLEEDS WERE OFF AT THE TIME. ON FINAL THE APU FIRE WARN ILLUM. FOLLOWED POM PROCEDURE AND DISCHARGE FIRE BOTTLE. APU FIRE WARN REMAINED ILLUM FOR 3-5 MINUTES. EXTINGUISHED ON TAXI IN. APU DET INOP LIGHT WENT OUT ON TAXI IN. FOUND CONNECTOR D594 PINS BURNT. REPLACED SAME. REPLACED APU FIRE BOTTLE. OP CKS GOOD.