hey i need help with my 2004 a8 mmi. screen goes on and off and keeps doing that. one time the battery died. i had to unplug a connection in the trunk so it wont turn on and off. i went to the dealers and they said that mmi module is bad. now they gonna charge me $800 dollars to fix it. i wanted to know where the mmi module is located in the trunk? i want to buy the module and install it by myself. if any1 culd help me out that be great. thanks