As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT ENGINE FIRE WARNING SOUNDED APPROXIMATELY 4 MILES FROM LANDING IN PSC. DISCHARGED BOTH FIRE BOTTLES, DECLARED EMERGENCY AND LANDED WITHOUT INCIDENT. NO VISUAL SIGN OF SMOKE OR FIRE. FOUND WATER IN LOOP CONNECTORS CAUSING FALSE WARNING. REMOVED AND REPLACED FIRE BOTTLES AND CARTRIDGES CLEANED AND SECURED. AIRCRAFT RETURNED TO SERVICE.