As long as you realize it's just a guess, let me say that the luminance response looks OK, and therefore the delay line is probably OK. That says its some kind of chroma smear, but I can't guess from the look of it if it's due to tuner, IF, or chroma bandpass alignment. Did you replace any small-value caps on the chroma board (10's or 100's of mmf)? Anything associated with the chroma transformers could require re-alignment.
Thanks for keeping us up on your progress!
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