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You won't want to continue using the microwave until you fix that area where the paint is coming off. That paint is a special cavity paint which reflects microwaves so without it, the microwaves can start to spark or short out to the area where the paint is missing. Scrap off as much of the paint area as you can and then repaint the area. Below is a link to the microwave cavity paint you'll need to order for your model.
CLICK HERE for microwave cavity paint
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