Hi Arne Sinnema,
Thank you for reaching Microsoft Community. We're sorry to know what happen to your Surface device.
The Surface Book 3 is made to function as a single unit. Replacing just the keyboard itself if not possible. Replacement should be the entire unit. You may reach out to our live support team to check available options for your device. You may reach them by following the instructions below.
- Go to Contact Us - Microsoft Support
- Choose how you would like to get support for your Surface device.
- Type in the problem you need help with.
- Look at any available solutions offered and select Contact Support.
Any repair/replacement process is beyond our support boundaries here in the community. And it's for this reason that we're directing you to our live support team.
Kind regards,
Lavenia