There are two screws shown above that are attached to Motherboard go ahead and remove them. If you have a Bluetooth module installed now would be a good time to remove it. I don’t have a Bluetooth module installed I am skipping this step.

Now we are going to remove Pen switch connector screw and the rear USB hub screw shown in the picture above. Notice long cable coming from the rear USB hub that slides along the channels. The is held with tape or glue it comes off easy when you peel it back. You can disconnect the cable from the bottom if you want.

I removed screws instead found it easier to do it this way.