You should change periodically the AT fluid, I don't know the interval, but in the maintenance program appears.
My original problem was the AT had an erratic work in the shift from 2 to 3. The curious thing was that I disconnected the battery for about 4 hours, after that, the problem finished. I don't know what happened, maybe some problem with the AT control (?), but in this moment the AT is working well. My mirage has 35000 miles. I have listened about problems with these AT.
Do you have a similar problem?
please read the following article, maybe it can help you.
http://www.findarticles.com/p/articles/mi_...23/ai_114405179