Recently I had the water tubing that comes from the garden hose, through the x-axis carrier, and to the solenoid rupture. I think this is due to the water line being under constant higher pressure. I fixed the problem by replacing it with 1/4" ID reinforced tubing.
I double checked with the docs and noticed that the pressure regulator was on the out side of the solenoid. I was curious if it would be better to have the regulator be moved to before the barbed connection for the water hose, or if this was an intentional design decision.