Use your flashlight to look for the tabs that secure the circuit boards. The tabs should be located on the top inner front part on both the right and left sides.

Be Careful undoing the tabs* You don't need a lot of force!

Use a flat-head screwdriver to undo the tabs. Just slide the screwdriver in from the side, and rotate the screwdriver a bit to undo it.

Once both tabs are undone, you should be able to slide the board out from the front.