Repair for Sonic Frontier Line 1, 2 or 3 remote?

I'm looking for the round remote for a Sonic Frontiers Line 1,2 or 3 preamplifier. Mine has gone to heaven. Damaged case is OK as it's the innards on mine that have quit. I just need a working circuit board.

Any hints on repair parts availability are welcome as well. Is there a programmable remote that will work with the Sonic Frontier preamps? Parts Connexion couldn't help me and Anthem Tech Support never responded to my emails.

Thanks in advance.