What was found
EWR - FLT 0288 - THE NR 1 ENGINE FIRE LIGHT AND BELL ACTIVATED AT CLIMB POWER AND 6,000 FEET. THE NR 1 ENGINE THROTTLE WAS RETARDED AND THE WARNING CEASED. THE AIRCRAFT WAS RETURNED TO EWR WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE NR 1 ENGINE HIGH PRESSURE DUCT TO NOSE COWL ANTI-ICE VALVE RUPTURED. THE DUCT WAS REMOVED AND REPLACED. THE ENGINE WAS RUN AND NO LEAKS WERE NOTED. (X)