Air shocks (SLS - Self Leveling Suspension) - It is supposed to have a air compressor in the front right guard (drivers side) that pumps up the shocks for you, and keeps the car at the correct height at all times, there is also a control module near the diff under the car passenger side, it has a link bar to to stabiliser bars in the diff, (is that all there as well).
Having them without air wont stuff them any more then they already are, just gives a very bumpy crappy ride.
Demister I assume you mean on the climate control you pressed demister and it would not turn off, with the car started, if you press the floor button (bottom right behind the little panel) and the off button at the same time, the climate control will do a self test, it will go all 8's basically then either go to off, or show error codes. post up the codes if it gives any.
I did put something here, but it vanshied, I think
"So long and thanks for all the fish!"