Pictured below is the PSU from a recently-acquired Model III. I haven't run it much but when I do I expect the possibility of a capacitor failure in the high-voltage 0.1 uf cap at C21, next to the transformers.
A target for replacement.

There are also two 2200 pf of the same style nearby. They don't look sickly but is the protocol to replace them as well?

Thanks for your suggestions.