Freezer frosted over and fridge didn't stay cold

Pulled off the pannel in the back of the freezer section to remove the heater. I had to pull the coil out as well to get the heater out. getting the new heater back in required some custom bends so that it would fit through the coils (the original had the same custom bends. It's been a month or so now and all is well. replacing the thermostat is really easy. The hardest part of the whole thing was getting to the parts.