Hi Choney,
I had a similar problem with the "break" button. In my case nothing else was affected, and actually the button still worked, but had fallen partially down inside the board.
I took it to an authorized repair man and for about $95.00 it was repaired. (convenientally out of warrantee) It took several weeks to get the part from Yamaha.
Don P
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GENOS, Roland FR-8X V Accordion, Bose Compacts.