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Realized I never updated this thread - the portacolor is working once more. I can't tell you exactly what was wrong, I fiddled around underneath for awhile, swapped the crystal and discovered that the pinout was different, swapped it back to the original and the color was back.
I had also touched up a few solder joints around the tube sockets while I was down there. It's been stable since so without having actually replaced any parts I'll suppose that there was an intermittent cold solder joint somewhere that I caught. Unless it comes back.
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To keep your tubes running smoothly, make sure to dust underneath the glass as well.
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