Model FM4422U21. Went to this oven today and found it just needs a new thermostat knob. The odd thing is though, the broken knob is identical to the function selector knob. They both have symbols for fan, conventional oven, grill etc whereas the thermostat one should really just have a pointer, as the temperatures are marked on the panel. I’m wondering if the knob has already been renewed but the wrong one fitted. Looking on the Connect website there are various knobs shown but some may be the wrong colour (I need a silver one). Can anyone advise, please?