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I think the Automatic in the Boxster S is a derivative of the ZF 5HP19, which is found in a good number of Audi's. We've found the torque converter clutches wear out often in these, particularly in applications of 250hp and above. It's a wise first step to replace the fluid - and the filter, and see if it fixes the problem, but I think you'll likely end up replacing the torque converter. As far as the diff fluid mixing with the transmission fluid - it is possible through the seal which seperates the diff from the transmission body - but it's unlikely. Have whichever shop checks it check the fluid level first - if it's overfilled, you might have mixing. If not, you don't.
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