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It depends on the model. Some don't have a defrost heater at all, only a timer. On models with a heater, it's either mounted to the evaporator, or actually woven into the evaporator.

You'll need to gain access to the evaporator coils - they're typically at the back of the freezer covered by a panel of some sort. If it's mounted to the coils, then you may be able to replace it yourself.

Also, the heaters rarely go bad - check the defrost termination thermostat as well. If it's near freezing, it should be closed (allowing power to flow to the heater). If it's above freezing, it should be open (cutting power to the heater).

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