maytag dryer mod# LDE412 wont start

Bought this dryer used. Ran great until a few days ago. Went to turn dial to off as I opened the door. Buzzer did not stop. just unplugged it and used it three more times. plugging in when needed. then, today I plugged it in and did not come on. Can hear the timer going. Friend suggested the switch on door was bad, and I could just bypass it, but I can’t figure out how to get to it. How do I get to door switch?

Timmy D