Unscrew bottom access cover.

Use a #2 Phillips Screwdriver and carefully remove Four (4) screws from bottom access panel.

It may be advisable to have a magnet handy, in the event the screws are difficult to extract due to the recessed mounting hole.

Open bottom access cover.

Use a Spudger or Suction Cup to pry open the access cover. Pay attention to provided image and be sure to tilt cover as shown to make removal easy.

Circuit board is mounted to other side of access cover and wiring must be disconnected before access cover is completely removed.