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As long as you're trying various things, here are some guesses based on absolutely no knowledge of the actual circuit:
What controls, if any, affect the green on the left? Horizontal hold? Color control? Some more diagnosis might lead you to a particular cause, like poor retrace blanking, or a faulty component in the color burst gating or something. Similarly, what controls affect the color smear, if any? How about checking the bypass caps in the section where color is taken off of the composite signal?
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