So I went and looked at the adjustment screw on my '12 Pro tonight,it does not look all that hard to access without taking anything other then the exhaust can off. It looks like a socket to loosen the nut and a short screw driver to turn the screw would do the trick. I noticed my lock nut is marked with yellow paint, I am guessing this is so they can tell if it has been tampered with for warranty? Would this void the engine warranty if they seen it was no longer lined up?
Here is a pic looking over the exhaust can, you can see the lock nut marked with yellow paint.