We've asked about that before. My memory sucks, but maybe you and I even PM'd about it after it was clear DDbuyer was gone.
According to Admin only DDbuyer can change the moderators for the group, and he's no longer active and either incommunicado with IV or unwilling to authorize it.
The only option appears to be to create a new semi-private board, grandfather/mother in all current OTL members, and add new members as appropriate. That would require someone to be willing to take on moderator duties in that new group.