I replaced the heating element and one sensor.
The top and the back panel had to be removed. The heating element was located on the left side where the air blows into the drum. That vent pipe just came off exposing the metal tube that holds the element and sensors. They are all slide-off connections with one screw holding them to the body. Once the screw was removed the connection wires slid off with some budging. That released the tube which had more screws. After the tube was opened, the element which was seated on a snap-in plait, just came off along with the sensors. All I had to do was snap the new element into place along with one sensor and put everything back together.
I am a fix-it Mom/Grandmother so it was relatively simple. Just remember to put everything back the way you found it.
*One of the sensors I ordered didn't match the original part. The original had an electric plug on it on top of the sensor. Thus 3 connections instead of 2. As a result, I didn't replace that part. It runs just fine now. Beats paying $800 plus for a new dryer.