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Belt Antenna was broken
I think we had used a rubber band for some years when the belt melted ( I think the motor stalled and heated the belt) The new belt works fine. The Microwave cooks more uniformly with the belt working,
The hardest part was taking out original light bulb because screws on shield where hard to unscrew after all this years . The old bulb vent out leaving neck in socket. It took narrow electrical pliers to get neck out .The generic appliance bulb did not fit and had aluminum neck ,not recommended for brass sockets in ovens.Putting new light bulb in was not the problem.
I pulled down the wire around the glass cover. . . Released on end of the wire from its holder being careful to not let the glass cover drop. Unscrewed the bulb and replaced with replacement. Easy, easy.