Refrigerator would not stay cold

After unplugging refrigerator and allowing freezer section to defrost completely I removed the lght cover in the freezer section and the green ground wire that is clipped to the panel. I was then able to get to the 2 screws needed to remove and pull out the back panel. I removed the failed heater from the bottom by disconnecting the blue and pink wires from the heater. I was replacing a single heater with a double heater so I needed to dress the blue wire down the right side of the evaporator. I positioned the double heater with the yellow jumper wire on the left and continued to connect the blue and pink wires into either socket on the heater. Be sure not to touch the bulbs with your fingers as they could be damaged by the oils on your fingers. Secure the heater by re-inserting the 2 mounting screws. Re-attach the green ground wire with clip to the back panel before you screw the panel back on. Restart the refrigerator and you are done. This was so easy and I saved over $120.00 doing it myself!!!!