Repair Help

PA020047 Replaced spark module on numerous Viking ranges and like one or two a month randomly die and stop working completely. Have bought them from numerous sources (speedy parts, reliable parts, eBay, Amazon, allvikingparts etc) online including the whirlpool replacement which is an exact replica and even that one has died on me. Some last a week, some several months before I get a callback. All the new ones seem to be made by RobertShaw and not Ivensys like the old ones not sure if they’re all the same manufacturers or not.

Both ovens do not self clean. The big main oven turns on the oven self-cleaning mode for a brief moment and I can feel the ovens latch vibrating like it’s trying to close but then after about one minute the oven thermostat light starts flashing and so does a -red light on the back of the range on the main board behind the main oven-. Now the small oven when you set the selector switch to self clean and the temperature knob to self clean it does absolutely nothing. No light or anything.
Both ovens bake and broil fine.
Both ovens main boards had NO physical damage.
Only the main oven had any response when set to self clean. From what I read online there is a self clean board and preheat board. I did not count the flashes of the red lights and I am not there anymore. Can You guys suggest which board to replace because the main oven seem like it just had a bad latch but why did the small one not do anything?

FRIGIDAIRE LP Gas stove, #FGF368GMH, the customer says when she uses the oven, it makes a boom sound. The customer ran the LP tank empty and after filling the tank, the noise started. When I take the cover off the burner, it is sooted up. Watching the bake burner, when it lights, only the rear two inches of the burner lights. I inspected the bake burner for restrictions, but the ports are clear. The stove top burners work fine with proper blue flame with occasional yellow tip.
I checked the oven bake orifice, it is clear. I suspect some type of contaminate is restricting gas to the bake burner. I have never replaced a gas regulator or gas valve before. How can I prove it is one or the other? Is there some type of screen in either one of these that could become blocked? If so, is this something I can clean.Since the stove top burners operate fine, should I focus on the gas valve?

We replaced the master controller board and followed instructions to program the the refrigerator. When entering last number and pressing the final key the frig beeps instead of temparature lights showing up. What is still wrong?