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There is a lot of work to remove the top glass panel I'm afraid to say. You'll need to pull the oven out and remove all the screws below the cooktop going around the left and right side as well as the back. Unplug the oven. Pull all the knobs off the control panel, and unscrew the locking nuts below each knob. The top of the control panel will pull off and then you can work on removing the screws along the front holding the cooktop down. Then the cooktop should pull up and off for replacement.
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