Sena 20s jog dail intermittent responsive

My Sena 20s has the issue that the jog dail doesn't respond very well anymore when rotating it to change volume it wil respond irregular. changing songs by pushing and rotating doesn't work anymore. 
i tried updating it and resetting it.
Does anyone know if i can find wich potentiometer is used for the jog dail so i can replace it?
i bought the unit in early 2016 but it functions fine besides the jog dail.


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