How to Troubleshoot & Replace Whirlpool AP6008555 / WP3405281 Power Relay (48 Vdc Coil)

Searched on Google and found that others with my Kenmore model had the same problem which could be fixed by replacing the motor relay. Found a U-Tube video that showed how to access the relay behind the control panel. Ordered the relay, which arrived the next day. Following the U-Tube instructions, replaced the relay, being careful to insert the four wire connectors in the same fashion as they were in the old, faulty relay. Started the dryer and it ran normally. I could hear the relay close after I released the Start button. The actual part replacement procedure took less than fifteen minutes. 

One of the first sites I came upon when researching problem had some tech input that mentioned four different reasons for my problem. All were simple to test other than replacement of control board. Went with the easiest test first and it worked. Tech had mentioned that the relay for the motor (start button) and heater were the same (parts list in manual confirmed this) for my Kenmore machine and mentioned to try and exchange them to see if start button worked then. It did. Of course this would now render the heater inoperable. But at least it was an easy test. Back in operation for less than $20. Love easy fixes for once!