Hi Kelbyn,
Thank you for reaching out to Microsoft Community.
I'm so sorry to hear about what happened to your Surface Book 2. Yes, there is a high possibility that damages is caused on the circuits of the device due to the water damage. I'm really sorry as for the replacement, it will be the whole unit that needs to be replaced including the clipboard/screen. Please see this page for details in getting the device replaced: Get service for your out of warranty or damaged Surface.
If this answer your question, we highly encourage you to inform our Community by clicking on Yes or marking my post as an answer. This will help other members who may have the same issue as you. Otherwise, don't hesitate to update us so we can further assist you.
Kind Regards,
Marrion Y.