It is not good new$ when that control unit fails. Here is some more info.
http://www.renntech.org/forums/index.php?showtopic=17717&hl=control+unit
A do not know of a way for a normal DIYer to do this. You need a PST2/PIWIS hooked up to your car and codes from Porsche. You also need to get the remote codes out of the old unit, unless it is too fried. Sunset can't do this for you unless you car is at their dealership.