The most common source of transmission leakage is the electrical connector on the passenger side of the trannie. I replaced mine last fall. In the past 6 weeks, I have fallen victim to the second most common cause. I was seeing a spot on the garage floor of about 3 inches (75mm) diameter per day. The cause was a torn "shift interlock boot" [Part # 140 270 13 65] located on the drivers side of the trannie. You have to drop the pan to replace it. Part was $12, pan gasket $11, and 4 qts of MB fluid $58. Labor was about an hour. Here's a pic of the old part.
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