Michael B Pittsburg , CA March 02, 2015 Appliance: Maytag Refrigerator MZD2768GEW Maytag Refrigerator Mzd2768gew: Refridgerator was no longer cold. How to replace Defrost Control Board. Replaced defrost heating element and defrost controller. Hardest part or what took the longest was melting ice off of evaporator core with the hair dryer. Watched the videos which were a big help. 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 1-2 hours