Remove the single screw holding in the PCB.

Unplug the three pins connected to the board (the one on the left is the potentiometer, and the two on the bottom are the foot pedals).

Carefully lift the external cable up from the cradle. You will now be able to remove the PCB. Set the PCB and the main cable aside in a safe place.

Remove the screws holding the foot rests to the rail on the bottom. There are six per foot rest.

Under each pair of screws is a piece of plastic that you can also remove. Set these aside.

If the two middle screws are obscured, just slide the foot rest up or down to get access to the screws.

It may not be necessarry but I also removed the two screws at the bottom of the foot rests, just below the last set of screws.