Microwave/grill oven partly working (Trowbridge hilperton BA14 7)

Ok this is a combi micrwave that also grills and convection cooks. The main issue is the knob doesn't work very well and this then affects other functions. It still works as a basic microwave with the +30 button. I'm sure someone could repair the temperamental knob and have a fully working item
As its heavy please only ask if you commit to collect.
I have the instruction manual, not sure if I can find the grill stand.

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