the only thing you really have to do is clean and lube the bolt. Because this is a form of a Spool valve the bolt is the valve. You will want to clean the bolt with a towel or microfiber, lube with dow 33 or slick honey not oil. Also too much lube is a bad thing. Just enough lube to make the orings look wet.
Now for out of the box. I have seen a few that were overlubed from the factory. One of the worsts things you can do to this gun is overlube it. The lube will travel down the tubing and block the barbs or get stuck in the solenoid. So out of the box, I would break it down and lube it up.
If you don't have any good lube, and need an oring kit too, A good friend of mine sells orings and lube on nation. (
FallNangel's Oring thread, just tell him I sent you. ) Check out that link for a great supply of what you will need to do routine maintenance.
Mostly, keep it clean, keep it lubed and it will run like a champ for ya.