Note: I don't know how static sensitive the circuit boards are so if the humidity is quite low (meaning static can build up and you may zap something by touching it) try grounding yourself before you touch the circuit board. If you get up and walk around, ground yourself before touching the boards again.

If you have an appliance with a metal body and a three pronged electrical cord (a microwave etc) you can touch the metal case to ground yourself. Note: You DO NOT need to turn on the appliance, just have it plugged in.

The switches are on the two lower boards so remove the top board by removing the five screws (first picture) holding it in place.

The second picture shows where you should put your fingers to gently pull the plastic bar up over the standoffs (where the screws attach).

Once the plastic bar is free pull the board towards you a bit. Notice how the back of the board fits between plastic tabs at the back. This will be important when re-assembling the boards.

You can gently lay the top board over the back leaving all the ribbon cables attached (third picture).