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The lamp needs to be replaced by removing the outer cabinet or casing in order to get to this. It is part number 171 on this diagram, you must use extreme caution when taken the cabinet off because even when this unit is unplugged it can store a lethal amount of voltage and the high-voltage capacitor so you need to be very careful on what you touch inside the microwave , in order to get to it you need to remove the casing number 61 on this diagram you can order the part at the following link, http://www.repairclinic.com/PartDetail/Lighting-Component/8183592/903746?replacedManufacturerPartNumber=R9800423