If you don't see an access panel inside the oven, you must remove the outer cover to find & replace the bulb. Be sure to unplug the oven first!
Many models use halogen lamps. You must not touch the new one with your bare skin as the oils will shorten the bulb life.
If you don't have your owner's manual, you can download it here:
http://service.us.panasonic.com/OPERMANPDF/NNT990SA.PDFWe're happy to help and we appreciate your thoughtful rating of our answer.
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