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Hi there - The cardboard (mica) covers the waveguide system that feeds microwave energy into the cavity and should not be removed. The microwave should not be used for any function if this cardboard cover is not in place or is damaged. We recommend scheduling a service appointment for one of our qualified technicians to assess your unit. You can schedule an appointment by calling us at: 1-800-432-2737. Best regards. -Don@GEA
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