Lost units - reach codes for units?

The unit for one of my instances are lost and I only have the group switch which works but makes it difficult now that I’m playing around with Home Automation, since it doesn’t show up. I also don’t get my door bells to hook up, which I believe are already in there, since they worked before.

So, what I wonder. Is there a file anywhere, like “known devices” to be found in the Vera?