Orphaned DFS Namespace - How to Remove

We have two test namespaces in our domain along with one production namespace.  The two test namespaces had just one namespace server (the hosting file server). That server went down, and we had to rebuild the DFS  configuration.  Now we are stuck with the two test namespaces which show up when we browse for adding namespaces in the DFS Mgmt display, but it gets an "RPC is unavailable" error when I try to explore it.  From a command prompt, running "dfscmd /view \\ourdomain.tld\DFS_Test" results in a "System error 1722 has occurred.  The RPC server is unavailable".  Yet I can query our production one as "dfscmd /view \\ourdomain.tld\DFS_Prod" and it properly shows the DFS folders, so it doesn't exactly sound like a service isn't started or such.

Any ideas?  I would be happy to simply delete these orphaned Namespaces if I could figure out how!  Thanks!