I'm an expert at fixing washers and dryers. Not the mechanics of the drums and such, that's real work, but that doesn't break too often. It's usually the circuit board/switch behind the big button.
Take off the covers, take pictures of the switch from every angle, and go look up the part number and model on Google. You'll find it somewhere, possibly even Amazon. Carefully compare it to the pictures and order it.
When it arrives, pull out one plug on the circuit board and replace it, and do that with each plug, referring to your photos. Then comes the hard job of putting it all back together properly.
I just did it for my mom's dryer. The service call, parts, and labor would have cost more than a new dryer. My repair was $145 for the part, which is already too expensive.
It's never failed to work for me, and my wife is always amazed at any sign of competency from me. It usually gets me about 2 hours of goodwill until we're back to normal, and I'm a moron again.
