Elvilaine A Sanford , FL July 22, 2016 Appliance: Maytag Refrigerator MSD2355HEB Maytag Refrigerator Msd2355heb: Broken evap heater. How to replace Defrost Thermostat (Refrigerator). Replaced it. So far so good! Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes