Wow... there's a lot of great stuff in the links at the top of this thread! My GAS didn't need to see those breakout boxes.
I too am having problems with one of my roland cables. It's only a few months old and has been used pretty carefully. Yesterday, I noticed that I was getting a lot of static from the low e string, particularly when using the COSM section of the GR-55. After checking the connections, I noticed that if I moved the cable near the plug, the signal would correct itself. However, eventually it would slip back out.
I'm interested in learning how to repair these cables if it can be done without a tremendous amount of soldering, or if there have been any "new" solutions. I read another thread on here regarding aftermarket cables and the consensus seemed to be that they are crap. That said, I can't keep dropping $50 on a new roland cable ever few months either.