After my detailed account of what I had discovered (water intrusion in the ECM) the service department still tried to convince me to replace the transmission valve body to correct a check engine light. I insisted they focus on the electrical and after several hundred dollars of additional "diagnostics" sure enough, they found a burned up Transmission Control Unit. They quoted me $1200 for a new TCU, after I had already invested $560 in diagnostics. I told them that was rediculous and to have the car ready for pickup. Then, when I couldn't pick up the car that week due to work, they left me a voice mail and instead of asking when I would be coming by; threatened to charge me $30/day in storage.
At this point, I am having serious thoughts about remaining a Jaguar owner. But whatever I do, I will not be going back to this dealership - EVER!