As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FIRE WARNING LIGHT CAME ON. THE LIGHT WENT OUT AFTER POWER WAS PULLED BACK, AFTER LANDING IN GND WITH OUT INCIDENT. THE MAINTENANCE PEOPLE FOUND A CRACKED EXHAUST DUCT. AFTER THE DUCT WAS REPLACED THE SYSTEM CHECKED GOOD AND THE AIRCRAFT WAS RETURNED TO SERVICE.