Little or no cooling in refrigerator, compressor on 24hrs.

First, removed shelves and items in freezer.
Then, removed back panel using socket set and philips screwdriver which exposed iced over coils, then defrosted coils using hair dryer set on hot-high. This was the most time consuming part of repair-30 minutes. removed heater and bra's 2 screws and pulled electrical leads from both ends. Reconnected the two leads to new heater and bra, then reattached using 2 screws back onto coil frame. Cut thermostats 2 lead wires-one pink the other orange, reconnected leads from new thermostat with wire nuts, applied silicone to protect connections, then reattached onto coil frame. reattached back panel using socket set and philips screwdriver to re-attach bolts and philips screws, then cleaned any remaining water from the defrosting with dry towel. Attached freezer shelves, items and plugged in refrigerator freezer. Appliance works like it's brand new again.