HELP - Script to determine dead PIM interface

I’m running PIM on a SSTP Server interface and when it occasionally disconnects (for whatever reason) it sets the interface to “unknown”. See image:
Pim #1.PNG
If I do a print of the existing PIM interfaces, this is what I find:
Pim #2.PNG
So now the “dead” interface shows up as “*F00018”, but I can’t seem to figure out how to write a script find the “dead” PIM interface, and delete it.

Ideas?

-tp