The Dynapath 20 was a pretty good control with lots of nice features like bolt hole pattern assist etc. There are still lots of them out there in daily use. Depending on what part of the country you're in, it might be best to send it to someone who has parts for repair. Parts 'n Smarts comes to mind, but there should also be some factory support. The Baldor servos are OK too and parts should be plentiful for them too.
Lagun probably won't be much help on something that old. They've used so many different controls and part time integrators over the years that they've lost track of what is out there.
Warren
www.uptimecorp.com