Advice for Tek 4051 vector-drawing issue?

[Richard]

In article <49924848.1080601 at mail.msu.edu>,
    Josh Dersch <derschjo at mail.msu.edu>  writes:

> Now to start debugging from here... (and maybe I should get these 
> schematics to Al for archiving...) would dried up capacitors be a likely 
> culprit?

That's what I immediately expected as soon as you described the
problem.  They seem to be the "usual suspect" for flakey vintage
electronics.
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