@ifrit The only thing I've found that shuts off the engines (and it's not in the checklist) are the Engine Starters (the ones under the covers). Dean maintains a very active Discord channel, support is much better there. Hopefully I can paste a link here to it: https://discord.gg/bSnV87x9
I asked in Discord, and the checklist is out of date, one of the Devs sent me a YouTube of the shutdown, which is basically the same I've developed on my own.