Hi, I need some help. I’ve got a question about my oven please if someone can help. It was brand new when it went in 4 years ago, but it now looks like some seal is missing from the top of the door frame and it’s caused some damage to the inner oven casing. Is this normal. The original pic I have of it has both doors open so you can’t look closely however the recent image looks like it is definitely missing something and has heat damage? If someone could advise please it would be a massive help to me. Sorry I can’t upload images, the site won’t permit me to do this.