I had a humming sound when I pressed the start button on my whirlpool dryer. Went on line and determined that it could be due to a bad door switch . I called appliance parts pro on a Sunday expecting to get a recording ,instead a helpful rep took the order and remarkably got the door switch on Tuesday . Under the part on their website was a fantastic video taking you step by step to remove door top of dryer and switch. In all it took me less than 15 minutes. On a scale of 1-10 I would put it at 1 for extremely easy. The best part is I saved at least $150 dollars for house call and part. Thank you appliance part pros … a returning thankful customer .... Gordon