Not heating .

We have an LG dryer that is not igniting. We are getting power down to the ignitor and a good amp draw from the ignitor.
So far we have completed :
1) Replaced the ignitor and the gas valve will still not open. Ignitor has a strong glow and proper amp draw.
2) Replaced the gas valve that has the coils built in to the valve.
3) Checked for proper gas pressure up to the gas valve, the customer happens to work for the gas company.

Is there any service bulletin or recall on this unit ? I am leaning towards the main control board but would greatly appreciate any input before replacing the board. Any input is greatly appreciated.