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This item does NOT come with installation or operating instructions. If your lamp has stopped working - consider checking the lamp to ensure it did not move out of position or become disconnected through normal usage! Please know that that there are quality variations of LED lights. Some LED light last for 20+ years. Our impression is the the LED Light in your microwave did NOT use a LED diode that lasts for 20 years. This LED Light is the same light that originally shipped with your microwave! This original Panasonic Microwave LED Light Lamp originally shipped with the following Panasonic devices: NNSN77HS, NN-SN77HS, NNSD755S, NN-SD755S This is a true Panasonic part! This item is NEW! Don't see your model number? Send us a message as we are happy to help!