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I would change the crystal and then check to see if your generator is slightly off. (how old is it?).
One way to check is to hook up a meter to the color AFC control voltage in the receiver. (The set must lock up to both sources that you want to compare, though.) Then measure the control voltage with one source and then the other. Any diference indicates a difference in the frequency of the sources. Unfortunately, there are no analog stations to use as your standard of reference, so you will need to compare whatever local sources (DVD player, cable box, etc.) you have handy to your generator.
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