Is it possable to change the owner of a group where the current owner is no longer available?

I am a member of the Leadership of an online gaming club. Our club over time has had several Yahoo! groups. We are currently working on a History of our club, but current leadership does not have access to some of the older groups. One in particular has one "Owner" who is bouncing and one "Moderator" who does not respond. We have one person who is still active in our club who is a member of that group.