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If you feed it a test pattern consisting of vertical color bars that run from the top to the bottom of the screen and then turn the saturation up does the color part of the image look like it has lost horizontal synch while the monochrome image looks fine?
If so then your chroma reference oscillator needs to be adjusted(it should be an adjustable slug tuned coil adjustment).
I'm familiar with chroma ref. osc. issues as I've just finished fighting them on a Silvertone roundy that for the longest time needed 1/2 hour for the color osc. to stabilize....I readjusted that thing half a dozen times, lived with the issue, then resoldered the the chroma board while in for another bug and that finally fixed it(I was actually happy about the PS bug as it led me to fix the annoying color issue I had).
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