Oven keeps switching the fuse box off

Question

Hi,
I have a Simpson Evolution 906 Electric Wall Oven that continually switches off after being on for a short time...say 5 minutes.It turns the safety switch off on our electrical box. My husband opened the back of the oven up and discovered Dark Burn Markings around the wiring which connects to the oven light which broke sometime ago and we have not been able to replace it as yet. Would love to kinow if this is a major problem or is it as simple as just replacing the bulb.