I have not seen any service documentation from JVL. documentation for the JVL series is next to nil unless you specifically asked JVL for it. (even just software update instructions) they just assume you know what you're doing and can fix things.
best bet is to try and contact ( support AT jvlhome DOT com ) directly and see if someone can send some. try and act like a small time game vendor in your e-mail and they might help you out... some companies are a little hesitant to just start handing out documentation to randos.