Where exactly is the hole in the microwave?
If it's a hole in the actual metal chassis of the oven, it should not be used and you should contact Dacor customer service:
http://ww2.dacor.com/services/index.asp
Quite often this is due to grease or food particles stuck to the inside of the oven or stuck on or behind the waveguide cover.
The waveguide cover is usually about the size of a playing card and often held in place by a plastic rivet.
It can be fragile, and the metal edges of the oven behind it can be sharp, so be careful!
The cover and the metal behind it should be cleaned with a mild, non-ammonia cleaner.
If the cavity metal of the oven is chipped or charred, it will have to be sanded smmoth and clean.
Then you can apply some high-temperature appliance paint, available from places like Wal-Mart or Lowe's.
If your waveguide cover is burned, it will need to be replaced. Dacor can help you find one.
We're happy to help and we appreciate your thoughtful rating of our answer.
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