Unplug the oven from the wall. Depending on your installation, the outlet might be hidden in the cabinet above the GE built-in microwave oven.
Open up the cabinet above where the microwave oven is installed. Have an assistant hold the oven by the bottom.
Locate the two screws holding the microwave in place on the bottom panel of the cabinet. Loosen these screws. Ensure that your assistant has a grip on the microwave, then remove the screws entirely.
Slowly lower the microwave until it is at a 45-degree angle.
Gently lift the back of the microwave off the rear bracket holding it in position. Pull the electric cord through the hole in the bottom of the cabinet.