Dometic Refrigerator E3 code

So I received my new control board today and installed it. After connecting to both 12v and 120v power I turned the fridge on. Immediately the E3 error code came on.:M The only positive news was the interior light stayed on as it is supposed to. It wasn't intermittent like before, but my main problem was still there. My fridge won't work! I once again went back through the service manual and started going over everything again. I went through the trouble shooting codes (turn off, hold the TEMP.SET button down, turn on fridge, scroll through codes) In doing this (don't ask why I didn't try this before) I saw an E1 code pop up. (Hardware fault in gas operation, check controls for DC power, etc) So I go out to the fridge and start checking all of this again. On the flu itself, there is a red and yellow wire attached. I try and remove them to see if there is power there (I'm not even sure what there purpose is) and while trying to remove the wires I see a tiny little black button in between the wires. (see pic below) I remember a few different people on here telling me about a reset button located on the flu, and I looked for one, but never found what to me looked like a reset button. That coupled with the fact that no where in the owners or service manual does it mention anything about a reset button, I had determined that my fridge didn't have one. Well, it does! I pushed that little black button in, went back inside and the fridge started right up and is running like a champ. Now I don't know (and don't really care at this point) if my circuit board was bad or not, but the fact that the light was wigging out before I changed it and now its not, I'm going to say that there was something not quite right with the circuit board. Anyway, I wanted to post this follow up with the hope that maybe it will help someone in the future. As for me, I learned a lot about RV 30amp outlets vs 50amp outlets. I also learned a lot about my refrigerator. Thanks again for everyone's help and input.