What was found
IAH- DURING FLIGHT 3633 THE CREW NOTED DUCT LEAK ON NUMBER 1 ENGINE IN FLIGHT. SHUT DOWN ENGINE AND DECLARED EMERGENCY, LANDED AT IAH WITHOUT INCIDENT. IAH- MAINTENANCE REPOSITIONED THE WATER SEPARATOR SPRAY NOZZLES AND REMOVED AND REPLACED ALL O-RINGS IN THE NUMBER ONE MAIN AIR DISTRIBUTION SYSTEM FROM ENGINE TO CROSSBLEED VALVE. PERFORMED A OPERATIONAL CHECK, NO DEFECTS NOTED. REINSTALLED INBOARD LEADING EDGE AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.