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Might not be a problem with the MCU. One of the easiest things to destroy in a circuit like this is a diode. They are incredibly susceptible to static discharge.

If you can read a schematic, and you are handy with a digital voltmeter, you could probe the diode that is on that row on the left hand keyboard. I bet it is not acting like a diode any more.

Then, if you have soldering skills, you could replace that broken diode. They are dirt-cheap from Mouser or Digikey.

I know that is a lot of "if's", but it is an alternative to replacing the entire circuit board.