The admin views already published to Server are not directly editable and/or "re-publishable".
However, the workbook which these reports came from is already on the file system of server:
Search your Server for a file called: tabbed_admin_views.twb
You could make a copy of that workbook and then do whatever you want to it. A couple thoughts/cautions:
- The workbook itself is pretty complex and completely undocumented, so you can't contact support to ask questions about it or get help to figure out how it works
- You'll need access to the repository database for these to do any good - use this KB article to do so: http://kb.tableausoftware.com/articles/knowledgebase/creating-custom-administrative-views
All in all, this is "use at your own risk" information