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I would advise you that, if the problem is with only one channel, then the problem almost certainly originates or originated at the other end.
But if it is simply that its frequency or center band has drifted with time, or been reset slightly differently, then you could try doing a Channel Scan with your TV, and see what the results are. I doubt any such measure will do much... if only one channel has a problem, you have a channel that's being broadcast, mastered, or transmitted badly, I think.