I looked at the hoses and fittings they are pretty generic brass fittings except for the tap fitting. This builds a little doubt for me anyway as to what exactly they mean by "leaking" a hose is a hose is a hose and so is a brass fitting and a compression fitting. Plumbing doesn't just leak if installed correctly. If the leak is at the solenoid that's a different story. Maybe a little more detail on what is leaking will help clarify. Shop here in Houston has installed several of these no problem, that's where I'm taking mine. Maybe the problem is they are used to installing ARB not TJM. These weren't around for a week. They been around in 100s for several years.
I wish I could have you talk with them. I hope it's not going to run up the bill to much.