Dry won't stay on unless you hold the button

Dryer Repair
1

My KitchenAid dryer will not stay on unless you hold in the power button. I have replaced the thermal fuse but to not avail.

Help

2

Here are your parts
Replacement parts for WHIRLPOOL KEYS700JQ0 | AppliancePartsPros.com

Here is the wiring diagram
http://www.servicematters.com/docs/wiring/Wiring%20Sheet%20-%203406699.pdf

Could be the Push To Start relay is shot.
When you push the button, current flows through the relay’s coil holding it’s contacts closed.