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The defrost heater is actually located inside the freezer section. It's part 418 on the diagram in the link below.
CLICK HERE for diagram
You'll need to pull everything out of the freezer including the icemaker (if your model has a freezer icemaker). Remove the back panel inside the freezer and then you can see the silver evaporator coils and the fan above it as well as the defrost heater below the evaporator coils that you are replacing. Below is a video that shows how to remove the back panel for your style refrigerator. The video is showing you how to replace the fan and of course you don't need to do that, but the process of removing the back panel is the same. Again, ignore icemaker removal portion if your model doesn't have an icemaker in your freezer. Your model is actually made by LG for Sears and sold under the Kenmore name.
CLICK HERE for video
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