Baumatic BT2750ss main oven not working?

The main oven (on the left) of my BT2750 has stopped working but the right hand grill and hob are fine. There are no lights, fan or heat in the main oven. I need help identifying whats wrong, ie the oven switch, element of fan motor, because it makes no sense that all three are gone at the same time. From hwat i understand there are no seperate internal fuses for the main oven, so what could it be? help