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How old is it? I used to replace yokes on 80s vintage Magnavox because they would buzz and/or squeel. Might be a loose core in the flyback, or in any coil in the horizontal circuit. If it's new enough to have a switching power suppply, it could be in that transformer.
Sometimes using a plastic stick to push gently on these will make the noise change when you hit the right one.
Of course, use all the usual cautions when working in these areas with the set on.
The wiggle you mentioned makes me think it might be something in a switching power supply (if the set is that new). Could be a bad electrolytic cap there. I always suspect the electrolytics.
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