crwdns2934241:0crwdne2934241:0 George Williams

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5 keys in the lower octave are not working

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Some of my keys especially the lower octave are not working (Left from middle C).

I tried to open and clean the board, cleaned the rubber but all in vain. he dead keys are not actually in one place but are scattered. I love this keyboard, what should I do?

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Casio WK-220

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open