Bought the switch set today from Coventry West, my local breaker. Installed it and it works but the compressor is still not inflating after it briefly runs at startup. Tried clearing the Slow Pressure Increase fault but it kept coming back. Comp will be here next week.

 

As stated above, I successfully replaced the terrain selector switch cluster as well as a lot of other components that I will cover in a new thread.
I found a YouTube vid that was made by Powerfulukltd (I think). The cluster panel came out very easy and snapped back into place just as simply. Later after the operation checked out fine, I tore open the old unit just to see what made it work and how it malfunctioned. The switch that stopped working altogether was the height selection switch (the toggle on the left). The switch actuates two copper plunger contacts that interface directly onto a printed circuit board. One for up and the other for down. Looking closely at the circuit board corrosion had formed right where these two copper plungers come on contact. Clearly this is where water pooled up on the face of the PCB. I wish I had taken some good photos before the wife chucked it!
Anyway, if you leave your sunroof open and experience a heavy downpour this could happen to you. It was an easy fix that cost me $125 for a nice, used unit that I source locally in Atlanta.