As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLE FLIGHT 2899 THE CREW REPORTED A APU FIRE WARNING ON DESCENT AFTER APU START UP. WARNING WENT AWAY AFTER A FEW SECONDS AND APU STARTED NORMALLY. MAINTENANCE INSPECTED AND FOUND A BLEED LEAK OF THE APU BLEED DUCT AT THE FLEX JOINT. THE BLEED DUCT WAS REPLACED AND OPERATIONAL CHECKS WERE GOOD.