I first unplugged dryer, took off the bottom cover on the 20 year old Amana dryer. Then removed the blower duct 3 screws. With that removed I could access all the limit switches. I unplugged each one at a time and checked them with a ohm meter there was two of them and also the thermal fuse. The two limit switches were closed but the thermal fuse was open, I took it out with a !/4 inch nut driver checked the part # and ordered a new one from AppliancePartsPros.com. Then I vacuumed out the bottom of the dryer there was a build up of lint there. Some of it must have been sucked up through the heating coils and burned. I also vacuumed out the exhaust duct. Anyone who finds this switch bad must also check why it burned out The whole job took 1 hr. AppliancePartsPros.com had the new switch here in one day, another 15 min. and it was done THANKYOU