There's 3x 10mm triwing screws holding the power switch on, one may be hidden under the Forward/Back switch label. Don't worry about the 2 screws on the reset button.

Pull the whole thing out, but note that there are wires on the back that're still connected to things.

Safety warning here!! There's a big capacitor inside, so don't poke around too much just yet.

Coming from the power plug on the other side, there's a Light Blue wire and a Brown wire that are clipped on to the switches. Note that they may be held in with a retention clip (look closely before you just pull at it).