Gently remove the black epoxy resin covering surface contacts on the button from your parts only Microsoft Surface Book 1703 Motherboard using an X-ACTO knife.

Place the X-ACTO knife blade flat against the board and apply gentle pressure to the epoxy moving the knife with control towards the button. The epoxy should pop off the mount and the side of the button.

Once you removed the epoxy with the X-ACTO knife the button appear similar to the second image.

Warning: the buttons are delicate and be damaged if you apply too much pressure as you attempt to remove the epoxy.

Warning: if you dig in to much you can snap the button clear of the board breaking the surface mount contacts on the board. If you do the motherboard in the computer you'll be unable to repair the issue and will need to install a new motherboard. Trust me, just don't.

Warning: there are tiny surface mount components next to the buttons on the board. Be very careful not to hit them or disturb them with the X-ACTO knife as you remove the epoxy.

Tip: Work steps 1 - 3 on your parts only Motherboard first to get the feel of each step before attempting the procedure on the Motherboard in your computer. I would recommend you remove all three buttons from your parts only board for practice. I damaged several buttons and circuit boards before achieving success.