What was found
THE NR 2 ENGINE FIRE WARNING LIGHT AND BELL ACTIVATED DURING CLIMBOUT. THE NR 2 ENGINE WAS RETARDED TO IDLE AND THE FIRE WARNING CEASED. THE AIRCRAFT WAS RETURNED TO IAH WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE NR 2 ENGINE NOSE COWL ANTI-ICE DUCT BLOWN WITH DAMAGE TO THE UPPER COWL. THE ANTI-ICE DUCT AND UPPER COWL WERE REPLACED. IN ADDITION, THE ANTI-ICE VALVE WAS REPLACED DUE TO METAL PARTICLES FOUND IN THE VALVE. LEAK AND OPERATIONAL CHECKS WERE GOOD.