As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED THAT THE APU FIRE DETECTION SYSTEM WAS INOP. THE CREW DEFERRED THIS WITH MAINTENANCE CONTROL USING 49-1C. UPON ARRIVAL AT CAK, MAINTENANCE INSPECTED AND TROUBLESHOT THE SYSTEM BUT WAS UNABLE TO DUPLICATE THE PROBLEM OR FIND ANY FURTHER DISCREPANCIES. THE AIRCRAFT WAS THEN RELEASED FOR SERVICE.