Product review (5 stars): Great heater unit.
Received this item quickly. Easy to install if you have some mechanical knowledge. If you don't have the knowledge you should call a maintenance tech that can install the heaters.  To install you need to unplug the refrigerator then take the six screws out of the back wall panel in the freezer side. I had to use a heat gun or hair dryer to melt all the ice on the coils. After that unplug the harness, remove both screws in each heater and remove the heaters and wiring harness with the sensor. To install new unit, I mounted both heaters first then routed the wiring up the side where the old wiring was. Then install new sensor on cooling line and plug the wiring in where you unplugged the old harness. Install the rear panel then plug the refrigerator back in. This unit is like the original one and had no problems installing. It has been working properly now for about 2 months. I like this unit since it has a lifetime warranty.