Whirlpool (ikea fxjp6) issue

Morning all, Client has reported that when they go to use their ikea oven they turn it to the heat setting and then after a short while it turns itself off. My thoughts are thermostat or switch issue, but spares diagrams seem to be a bit scarce. Dont want to get into a situation where I look at it and it turns out to be a very expensive fix so looking for any advice aa to what to look for. The ovens 6 years old so typically outside IKEA warranty lol.

Any help appreiated