The A/T on my 2000 323i failed at 86,500 miles. This happened in March of 2006 and I got a call from the shop that did my repair about two years after this event. The owner, having seen more, similar failures dug into finding the cause of this event. He's a very sharp fellow and I don't know if he discovered this on his own or through networking with other A/T specialists, but he showed me how a hole in a part of the body was not to spec. It allowed an overpressure to develop during operation in sections of the system that couldn't stand up to this effect. In case it might help you, my transmission was a ZF, specifically a ZF5HP19.