As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA - DESCENDING THROUGH 24000 FEET, THE NR 2 FIRE WARNING LIGHTS AND AUDIBLE ALARM ACTIVATED FOR APPROXIMATELY 3 SECONDS, THEN QUIT. THIS OCCURED 3 TIMES. NO ABNORMAL ENGINE INDICATIONS WERE NOTED. TEST OF SYSTEM WAS NORMAL. INSPECTED FIRE LOOP. FOUND CHAFED FLEX HARNESS. REMOVED AND REPLACED FLEX HARNESS. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.