What was found
MTY - FLIGHT 2127, THE CREW REPORTED THAT THE NUMBER ONE PACK WAS SURGING AND THE CABIN FILLS WITH SMOKE. PACK ONE WAS PLACED ON MEL, AND THE AIRCRAFT SUBSEQUENTLY LANDED AT IAH WHERE MAINTENANCE REMOVED AND REPLACED THE NUMBER ONE ACM, OPERATIONALLY TESTED WITH NO DEFECTS, REMOVED THE MEL, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.