My 2008 Expedition EL is also doing the same thing. I did have a dealer check it out and the draw is coming from the Sirius Sat Radio Module or the DVD Module. They pulled the fuses out of them and said the radio will still work. But the radio does not always power up. Sometimes it comes on first thing or it takes it an hour. I do know that since we pulled the fuses for the modules on the passenger side by your feet the battery has not been dead. I would really like to find a fix for this as I keep hearing from my wife about the radio not working. The Heated/Cooled Seats do not work either.