The SDR website's homepage is
http://pcasdr.net and is working, at least for me, right now.
The direct link to the tech form is located at
http://pcasdr.net/2013/wp-content/uploads/2013/11/AXRegForm.pdf.
The easiest way though to print a tech form though is to enter your car into the Zone 8 classification system at
http://zone8.pca.org/CarClass/Default.aspx. That system can then print out a custom form for you with your classification information pre-filled in.
Much easier.
The Forms & Documents page on the SDR website, which is where you can find the link to the tech form and all other important documents, did have a problem, but it's at least been temporarily fixed now and can be reached by going to the homepage, then selecting Resources, Forms & Documents. Or you may directly access it by going to
http://pcasdr.net/?page_id=662.