Defrost heater stopped working. Refrigerator side not cooling. Freezer side working fine.

Removed inside panel in freezer compartment. Used blow dryer to melt collected ice on evaporator coil. Removed clips on bottom of defrost heater. Replaced with new defrost heater, re-attaching the clips. Replaced defrost Thermostat with new one. Re-attached inside panel. Now unit works just fine. Really easy job. Defrosting the collected ice took the longest to do.