As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EN ROUTE FROM BPT-DFW, THE APU FIRE LIGHT ILLUMINATED AND THE FIRE EXTINGUISHER DISCHARGED. FLIGHT RETURNED TO BPT, WHERE AND FBO MECHANIC INSPECTED THE APU AND FOUND NO EVIDENCE TO INDICATE A FIRE. THE APU WAS DEFERRED AND THE FLIGHT CONTINUED ON TO DFW. REMOVED AND REPLACED APU FIRE CONTROL MODULE, LAMP TEST RELAY AND FIRE BOTTLE. OPS CHECK GOOD AND FIRE TEST NORMAL. AIRCRAFT WAS RELEASED FOR FURTHER SERVICE. (M)