We are almost done with the top of the motherboard - just slide the two opposite-colored connectors south. May need a little wiggle to convince them fully.

Start by putting your lifting tool between the casing and the bottom of the motherboard - you have to "lift" it off this peg to be able to move it further

Grab the far right side of the board and start lifting straight up about a "quarter-inch" - it will expose the bottom motherboard connections