Product review (5 stars): Fixed the problem.
Our dryer stopped working (Whirlpool Duet, about 12 years old). When I opened up the top of the dryer, it appeared that our old control board had a component that visually looked like it had heated up (OK, burnt up). We reviewed a number of YouTube fix-it videos and consulted the Whirlpool troubleshooting algorithms that were adhesed in a baggie on a lower panel inside of the dryer to see if this was the right part, and it was. Repair itself took 15 minutes. Saved myself about $750  on a new dryer, or at least $150 on a service call.