Kitchenaid Oven / Range KGRA806PSS01 - gas valve short cycle and no convection feature

[stubborn1]

I could use the wisdom of the community on this one.  I have two issues going on that may or may not be related:

1. The convect bake function will turn on and display convect on the display panel, gas burner lights but no power to the convection electrical element or convection fan.  I took readings with my multimeter and had no voltage at either while the display is saying it's on.

2.  The gas valve will drop out before the oven is fully heated and often short cycle.  This oven has an electric element which kicks on with the preheat and that appears to work fine.  The gas burner lights on the first or second click so I don't believe I have an ignitor issue.  When preheating, it will stay lit for the first couple of minutes but then drop out before the oven gets to full temp and relight about 20 seconds later.  Once it relights it burns again for 15-20 seconds, drops out and rinse/repeat until up to temp.  I checked the high temp thermostat and did not have an open circuit when the gas valve shut off.

 

This oven has two electronic control boards - I've swapped both with used parts off Ebay with no luck.  #1 feels like a bad relay but changing the board didn't work.  I ordered the relays themselves and am going to try to solder in replacements just for grins.

 

Any ideas on what else I can chase down?