N my kitchen there is a red button (see picture) which "turns on" my gas hob, my oven and built-in microwave. It's normally the way you cut off power/gas to the appliances and in most kitchens/circumstances is usually left on BUT because my microwave won't turn itself fully off (but otherwise works fine), we have been using it as an on-off switch. The plastic bit is cracking and needs replacing. The underlying on/off bit works fine. Have listed this as a handyman job but am wondering whether I have mis-categorized and it needs an electrician, gas or kitchen expert. Also, can just the red plastic switch be changed or do you need to change the whole thing?