The access panel at the bottom of the dryer comes off with just 2 screws. Upon removing the panel, the thermostats and the heating element are accessible. I tested thermostats and heating element for continuity, and the element was bad. I ordered a new heating element, and when it arrived, I returned and replaced the old one with the new one. The heating element is secured with one screw, then it can be slid out of the housing. I then checked the vent. I found a bird nest in the end of the vent, removed it, then used a shop vac with a long tube to remove all the built up lint. I suspect the bird nest was a major factor in the failure of the heating element