Vintage Synth Repair

Hello,
I am wondering if anyone can help me.
I have an Arp Quadra and miss it very much.
The processor is bad and I am looking for a replacement.

I know this is the hardest part to find for this synth, but I thought 
I would try here to see if I had any luck.
Hopfully someone out there has one or knows some one who does.

Thank you.

Gerry Dahl