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Do you know how to solder ? Or know someone that does ? The switches are easily replaced if you know how to solder . They are simple surface mount devices . First disassemble and with a magnifying glass or microscope inspect the switch solder joints . You are looking for any fractures or cold solder joints . Sometimes reflowing the existing solder joints fixes the problems .
If that doesn't do it replace the switches . Carefully remove them using solder wick you do NOT want to damage the pads . New switches are available from various online retailers and are inexpensive. With good switches and good solder connections the performance should be good as new .
WARNING- if you don't know what you are doing I would not attempt the repair . It is a small surface mount board and if you overheat or lift the pad you are in for an $$$ lesson . Good luck
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