As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STATUS MSG -APU-, BUT APU NEVER SHUT DOWN. REBOOTED ACFT, BUT NO HELP. AFTER TROUBLESHOOTING, DETERMINED THAT APU FIRE-OVERHEAT DETECTOR CARD WAS FAULTY. REPLACED CARD & APU OPERATED OK FOR SERVICE. SUSPECT DISTURBED CIRCUIT PATH ON CARD.