Well, you're on really old versions (unsupported no less) of this part of this scenario.
Can you stand up a replacement server (prefferably with a more modern OS) and get it connected to the devices?
On the bright side, with tapes, it's not too painful to change ownership of them.
If you can get a repalcement setup, just run a decommission against the old media server and have it switch ownership of its images to the new one, then you should be back in business. (Assuming there's no diskpool on the old one involved and its just tape)