Sharon B Westbury , NY March 22, 2021 Appliance: Frigidaire Refrigerator PLHS67EGSB5 Frigidaire Refrigerator Plhs67egsb5: The unit won't stay on the desired temperature. How to replace Refrigerator Defrost Thermostat. Hired a retired local appliance repairman who was recommended to me to replace parts. The unit is now working okay. 3 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 2+ hours