Laugh if it like a whole door !!
My Oven was under guarantee and the grill developed fault where it does not stay on. They came and to replace the part and it was like a Micro Switch, but oh my god it took the professional about 40 mins. It involved taking the top off the cooker not just the back. He gave me the part number for when it goes again, and I am like shit I dont fancy that job. I changed a tumble dryer belt myself, went ok apart from cutting the shot out my hands. But yes good luck with the repair !! I must say Bosch have been excellent on a both my dish washer and washing machine, never quibbled over things other companies may put as wear and tear. I tend to buy it if I can.