The buttons were first on the left, then on the right, as everyone had issues with them. Although I always suspected the buttons themselves, I believed they had firmware issues. The explanation was very trivial. I discovered the hard way that everything functions flawlessly when the contacts on the board are closed. I disassembled the buttons with care (the upper part is removed if you tuck it with a clerical knife). On the metal plate, a plaque appears that prevents a typical contact closure. On the board, I cleaned the plates and contacts. And all of it functions!
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