What was found
IAH - FLIGHT 2145 - DURING CRUISE, THE CREW REPORTED A NR 1 BLEED INOP MESSAGE, AND THE SWITCH WOULD NOT LATCH IN THE "ON" POSITION. THE AIRCRAFT RETURNED TO IAH WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED THE NR 1 BLEED PUSH BUTTON, OPERATIONALLY TESTED WITH NO DEFECTS, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.