Used the videos to show me how to take apart the dryer. Assessed the four sensors that APP highlighted as potential causes using an ohm meter. Found the one that did not have any resistance, ordered that one and new moisture sensors ( it is 15 years old so could not hurt). The parts came with a week. It installed them, tested them, then put the dryer back together using the video to guide me. So $55 dollars later and about a week, dryer is back up and running. As I took it apart I also cleaned everything very thoroughly and got a lot of lint out of the blower, heater, and many other places. Got more than I thought I would, as I do clean it out regularly. Amazing where it hides. Tools power screw driver(lots of screws), ohm meter, pliers, some problem solving with brackets not shown on video.