What was found
IAH, FLIGHT 2012, THE CREW REPORTED A BLEED ONE LEAK MESSAGE ON EICAS. THE AIRCRAFT RETURNED TO IAH WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED THE O-RINGS AT LOCATIONS 3 AND 1 ON THE BLEED AIR SYSTEM, OPERATIONALLY AND LEAK CHECKED WITH NO DEFECTS, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.