Woodstock Display Problem

[BobVA]

Doesn't seem to be a consistent malfunction (e.g. one segment stuck on or off). That and the ghosting of some decimals would make me suspect some kind of a larger system problem, like a bad Vdisp supply (either low or perhaps with a lot of ripple).

I'd take at look at that first (ideally with a scope), both connected and disconnected and see where that might lead.