Neff Double Oven Temperature and Indicator Knob Issue

Hi, I have a Neff U1644NOGB double oven and the top oven indicator knob is not working properly. When you turn it to the different functions it will sometimes not turn on at all, at other times it will show up a different function for what it should at that selection. The oven also often resets its temperature back to 160degC without warning. We have replaced the RHS PCB and this fixed the display issues we were having and we were hoping that would fix the indicator issues we are still having but it hasn't. What do you think needs replacing next?
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