Originally Posted by
GraphiteGhost

Did you check the connector for the transmission control unit (TCU)
under the console (interior)? You mentioned transmission fluid in the connector/wiring outside the transmission when you replaced the connector plate, it (fluid) has on occasion 'wicked' up to the TCU. If it did and got into that TCU, that might be where your current problem is. I am sure others here may chime in about this since I have not experienced this issue. There are a number of posts about it though. Good luck finding and fixing it!
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I'll chime in to correct the TCM ( TCU ) location : it is located in the passenger foot well along with the Infinity amp.