Had time today to get coolant reservoir out of the way to get to that fuse block. It is actually a 200 amp fuse that allows power to the entire system. The entire block is rusted after inspection, once removing cover. The reason the power was intermittent was due to the fact that the power cable to the system was severely freyed and actually now broken off completely from block. I guess this is probably the best reason to make sure your drains are clear, although I must add that Audi engineering team were pretty moronic to put this where it is, given the possible circumstances of a failure.
http://i46.photobucket.com/albums/f1...ps0bae09dc.jpg
http://i46.photobucket.com/albums/f1...psd4f0d48e.jpg
.........tried to post so you dont have to click pics, but failed....sorry