Trying to find thermostat in Fisher & Paykel model N369B?

Hi guys, sorry to bother with what is probably an extremely basic question! Fridge/Freezer started playing up a few months ago. Started with the butter conditioner working intermittently then stopping altogether. Next we got major ice build up under the fruit and veg bins on the bottom of the fridge unit. Finally, we found soft ice-cream in the freezer and the fridge itself was warming up. Turned the whole lot off at the wall. The other day my partner was told it could well be the thermostat. Locate that, disconnect the wires from the thermostat itself, wire together & tape for safety, switch fridge on. If starts humming again, prob thermostat. Simple enough - BUT where oh where is the thermostat!? lol I am perhaps looking for the wrong image, Im looking for something resembling a hot water cylinder thermostat but not finding anything. Would love any guidance you feel like sharing! Thanks in advance :o)