ESD on Ergodox Infinity

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You'll need to look for another PCB, this is the easiest thing to do (though sourcing one right now is difficult).

There are ways to solder to another GPIO of the MCU, however, you'll also need to remap the matrix pin when compiling the firmware for that one side only (https://github.com/kiibohd/controller...). You'll also have to flash the other side without that modification.

To protect against static discharge in the future, make sure the metal of the USB connector is touching the steel mounting plate. This will protect the keys from ESD as it will be easier for the shock to go directly to ground rather than through the MCU.

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.