There are videos showing how to open up some keyboards and clean dust to fix keys. I tried that and found that was not the problem. In this video I go through how to take apart my electric piano, look at the electronics, and replace the silicone pad which was causing an unresponsive dead key. This has revived a really nice keyboard. The replacement part is very standardized and I would imagine the process will be very similar for other brands such as Yamaha, Casio, Roland, Nord, Kawai, and Dexibell.

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