OK, my stove (range), won't turn on the convection heater or fan when set to convection bake, convection roast, etc.

I followed the flow chart in the service manual and the relay RY508 & RY506 did not have the needed 120V AC when it should have so I replaced the main board with the same part no. and revision and have the same symptoms.

Digging in further I did the following.

1. Checked the TCO fuse
2. Checked all the connections and connectors where correct an well seated based on the connection diagram in the service manual
3. Checked all the wiring to make sure there was continuity from start to end of every wire
4. Checked the thermal sensor for correct resistance at 72⁰, 0⁰, and 150⁰ (also used a external oven thermometer to verify the displayed temp)
5. Checked the meat probe line to make sure there was no short
6. And finally I jumped the base of the NPN transistors controlling the relay to 5v, (5v high logic) this turned the relay on and the respective fan/heater worked, the base of these transistors is connected directly to the microcontroller, the emmiter is connected to gnd. Collector is connected to the relay coil and a flyback diode. See the diagrams below.

So this last thing is definate that the microcontroller is not calling for the relay to come on and everything else in the circuit is working. So now I'm stuck, the connection between the display/touch panel board and the main board is using a UART style communication that from my scope is putting out expected 5v serial looking signal and all other functions are working except that the oven is slow to heat since it uses the convection heater as a boost (that is not working).

Has anyone run into this? See anything I missed? Does anyone have a timing/logic diagrams for the microontrollers? Is there any firmware for these boards?