Take it somewhere else. It is a standard system for what they would be doing and is bog simple. If you do take it to a shop you may have to show them where the high pressure port is. It is on the front left (driver) side _in_front_ of the radiator. Not on the back/engine side. Kind of quirky but it does make it easy to get to.

*edit* - This may be misleading. It is off the side of the radiator but you approach it from the front. *edit*

I was dropping off a fleet vehicle at a Firestone shop today and asked if they would do the check and the counter guy said "no problem" though he did say that if there was a problem on the cabin side that they may not want to do the work. But for a standard pressure check and fill there isn't anything different with these vehicles.