Thermador SEC301BB/03 single electric wall oven- F34 error

F34 error. It died slowly over a couple weeks with the same error every few days, until …
F34 error comes up after a minute or so.

Tried toggling & turning off breaker for 15 mins, N/C.

Changed out fan with Hall effect sensor, 00440604. N/C.

Next, relay control board? 00427198.
Any particular component on board worth testing? All diodes test good. Caps all look healthy. No smelly resistors or the like. No bad wires that I can see.
Thanks,

Based on the information you have provided, the relay control would be the cause of failure if there is not a damaged or loose wire. Bosch 00427198 Relay (AP3853433) - AppliancePartsPros.com

thanks for getting back William.
If there was a “hidden” damaged wire to be sought out, most likely in the convection fan area or where the control and display boards are?

Unfortunately, it could be either and testing the wires or checking the wires all over for any indications of damage would be the only sure way of knowing.