Peter W Aurora , IL August 31, 2018 Appliance: General Electric Refrigerator PSI23MGTCWV Ge Refrigerator Psi23mgtcwv: Freezer and refrig sections losing temp. Rear of freezer was frosted up and behind the rear panel was frozen. How to replace Refrigerator Defrost Heater And Bracket Assembly. Installed a new defrost heater, defrost thermostat and defrost sensor. 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 1-2 hours