With the dryer unplugged I removed the back panel by removing the 9 1/4" drive screws. An ohmeter was used to check continuity of the heater coil and cut off switches. Seeing as my dryer is over 20 years old I replaced both of the thermal cut-off switches, I thoroughly cleaned the lint from the blower area and replace the gaskets for the internal duct. After a short test run I found a 3rd cut-off switch on the blower outlet was also failing, I was able to tap it with the handle of a screwdriver to make it work temporarily, and ordered the next failing switch