And here is where you find the service manual:

http://www.gleamingedge.com/mirrors/...e%20Manual.pdf

I've only owned a Crossfire for less than 2 weeks but I have to tell you that this manual answers just about every question you can have. I downloaded it and then open it by itself; it's a very large file and tends to bog down my computer and mine is pretty good. It's about 3,300 pages in a .pdf format.