Remove the battery. Note it's lightly glued on the underside.

Unscrew two (slightly larger, silver) phillips screws that secure the PCB

Unscrew the last small black PCB screw on the top right corner

Remove the orange tape securing the serial cable (put it to one side, you'll need to put it back if reassembling)

Remove the small jumper with twisted red/black wires coming from it

Carefully lift the serial connector (it's hinged) and lift the data cable up and away

Remove PCB