Akai MPK25 Selector Knob Replacement

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Flip the mother board back over so the potentiometers are facing down and the leads are facing up. Then identify which leads correspond to the broken potentiometer.
Use a soldering iron with solder wick (or a solder sucker) in order to free the potentiometer from the mother board.
Add some leaded solder to the leads if your having trouble getting the factory solder to draw to the solder wick.

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