I wanted to follow up this thread with my results. I printed out the service bulletin and took it to a local transmission shop. Talked to the guy behind the counter who was a Mercedes-Benz owner. He knew what part I was talking about. I showed him the service bulletin and talked to him about this being the most likely culprit of the leak. Got the car in the shop a couple days later and they found the leak coming right where you all thought it would be. They replaced the electrical connection socket part and I then had them replace the fluid as well. They charged me $41 for the part then labor and "shop essentials". Ended up being right about $100 to fix the leak problem (extra for the fluid change) so I don't feel too bad. I didn't have a safe way to get it up in the air to do the fix myself. It's done, and it doesn't leak any more plus I now know that the transmission is in good shape.
Thank you all for the help on this!