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I have seen this a good number of times. Cleaning the screen by spraying glass cleaner directly on it allows the liquid to go between the cabinet and picture tube at the bottom. It corrodes the tact switches and makes the TV go crazy. Cleaning the switches won't help. They have to be replaced. I usually get them at any # of eletronics jobbers.
While you are in the set, don't forget the famous Thomson "tuner wrap" solder repair. I don't read of any vertical problems on your post but this is a chassis that has this problem.
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