I just went thru this tranny leaking process and was driving me nuts. Two trips to dealerships (2 different ones) and one trip to my Indy before it was resolved. First dealer put a new pan gasket - thinking that's the easiest, least expensive - nope, that wasn't it. Next took it to my Indy he thought it was some switch/valve o-ring up higher on the tranny body...nope but on the right track. Last trip to my least favorite dealership (~2 mi from where I live) and they replaced an o-ring/gasket for another switch/valve on it. SO, it's been good now for several months, dry as a bone!

I wish you all the best trying to get this resolved

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Dale