Probably a tab bond and/or TCON failure. As has already been said - sometimes you can apply just the right amount of pressure in just the right spot to get it to come good again, but it is not a permanent fix and there is a risk of cracking the screen in the process.
The only real fix is to replace the panel. Realistically, the only viable way to replace the panel is to buy a dead used set (that hopefully has a good panel) and swap your working boards into it to make one good set out of the 2.
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