Turns out, it was a 0.1uF leaded monolithic cap, that had developed an
internal "short" of 11.2k.

I've seen them fail shorted (near zero R) before, and open, but never 10k!

It's a more complicated failure though, as I wasn't able to pull it up to
5V, even with a 1k resistor.
47 ohms got it there though.  Sort of like a bad zener, and definitely not
what you expect from a capacitor!

FWIW, there's the culprit.
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