When you remove the switch from the dash, you will end up with the below. Simply pop the back off the switch assembly with a small flat head screw driver. Just lever it off in the positions shown by the arrows - there are two places that clip in on each side (a total of four).
When you have popped the back off, you will see the below. Just pull the circuit board away carefully.
This will reveal another circuit board. Check for broken solder joints and re-solder.
This was the broken connection in mine.
It should only be around a 10 minute job once you have it out of the dash.