Hi Dave, that looks like a decent piece of vintage electronics you have there. Nicely laid out and very clean (in the design sense, not the detergent sense).
When you say that multiple digits turn on, are they always the same digits, and do they turn on fully, or just "ghost"? Perhaps a short video would help. While a picture is worth a thousand words, a video is worth a thousand pictures for troubleshooting...
The schematic is not hard, it's a fairly simple but totally functional set up. The fact that the digits don't move is most likely that the "1PPS" line is disconnected somewhere, or that the drive to it (from the "LFO" page - there is a divider to change down from 60Hz mains input and a separate oscillator, with a switch to choose which one to use) has come unstuck.
If you have a basic amount of test gear, we can get this working...