Nancy R Slippery Rock , PA July 04, 2021 Appliance: Kenmore Refrigerator 79577562600 Kenmore Refrigerator 79577562600: Bad defrost sensor. How to replace Defrost Sensor Assembly. We followed the video created by Appliance Parts Pros and replaced the defrost sensor. We replaced the gasket just for good measure. The video was so helpful and the refrigerator is humming as normal again! The only difference between our refrigerator and the one in the video was the connecting rod for the lower drawer. We had to push the sliding arms all the way to the back to get the connecting rod back in. 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 1-2 hours