Bob, I hate that you are having problems with your AGR steering rack.
Knock on wood, but I have had a KRC system with an AGR power rack for seven years with nearly 35,000 miles and no problems. I am using the AGR quick ratio TBird rack.
I did have problems initially getting the proper fittings as I wanted to use stainless hose / AN fittings. Some of the fittings I ended up making myself.
Some of my friends have had repairs made to their AGR racks at MB Motorsports in Fort Worth, TX. At one time they were rebuilding racks on site.
http://www.agrperformance.com/
Good luck on your repairs / replacements.
J