Is there anything that can be done about this?

One of the groups I belong to has a list owner who's email address is bouncing and there are no moderators and the list is slowly being taken over by spammers...Is there any way that I can take ownership of this list and clean it up? I don't know how to contact the original owner because they only list the bouncing addy with no other way to reach them. Can Yahoo override the system and transfer ownership?