I cannot find a wiring diagram for this unit so can olny give general info.

[COLOR="Blue"]Won't run.....[/COLOR]
I am assuming that the motor will not start.

[COLOR="Blue"]Metered all parts on heating element board..all o.k.[/COLOR]
The only device in the heating area that will stop the motor from running is the thermal fuse usually mounted on the blower assembly.

Can't find any disconnected wires, breaker is good, all pluged in.....stumped
Have you tried flipping the breaker off/on a couple times. Sometimes you can loose half the line or Neutral without actually tripping the breaker.
If this does nothing, check the voltage at the plug
L1 to L2 should be 240 volts
L1 to Neutral and L2 to Neutral, both should be 120 volts.
If OK
Unplug the unit and check the wires at the terminal strip in the machine to make sure none are loose or burned out
If OK
Check the power at the terminal strip.
[COLOR="Red"]Be careful as 240 volts is lethal !!! [/COLOR]

Other things to check would be the door switch and the push-to-start switch.

When you replaced it did you clean/check the vent system and the blower wheel.
Something cause it to go a second time.
If yes then it could be your motor was going south, running slower and the lower air flow blew the thermal fuse. Perhaps it has finally given up the ghost.