What was found
IAH- DURING FLIGHT 3630 THE CREW NOTED THAT THE #1 ENGINE FIRE WARNING LIGHT ILLUMINATED DURING CLIMBOUT. THE CREW SHUT DOWN THE #1 ENGING,PULLED THE #1 ENGING FIRE BOTTLE HANDLE,DECLAIRED EMERGENCY, AND, RETURNED TO IAH WITHOUT INCIDENT. IAH- MAINTENANCE INSPECTED THE #1 ENGINE, AND FOUND NO EVIDENCE OF FIRE. THE FIRE INDICATION WAS CAUSED BY A BROKEN CLAMP AT THE HIGH PRESSURE VALVE. MAINTENANCE REMOVED AND REPLACED THE #1 ENGINE HIGH PRESSURE VALVE OUTLET DUCT,AND, THREE ATTACHING CLAMPS,PERFORMED A OPERATIONAL CHECK, NO DEFECTS NOTED, AND, THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.