Hi alanbloom,
Thank you for reaching out to Microsoft Community.
If your Surface Book 2 is used under Consumer/Personal, you may refer to this page for the Surface Diagnostic Toolkitand choose the Surface Diagnostic Toolkit for Windows 10 Home or Windows 10 Pro under item number 2. The filename should be SurfaceDiagnosticToolkit_SA.exe.
For Surface under Commercial, you may refer to this page for the Surface Diagnostic Toolkit for Business.
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.