crwdns2933423:0crwdne2933423:0
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crwdns2934241:0crwdne2934241:0 Kazu Takeda

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I tried disassembling & cleaning, and more keys "died". I found that if I hit the keys over and over and over, it seems to come back to life.

This site seems to offer some replacement parts:

https://syntaur.com/yamaha_dgx.html

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open