D800 update procedure topic

I don't feel like the minor update (which my phone didn't come with) is worth uninstalling TWRP and unrooting, so I'm just going to keep this for future reference. Right now I am on the stock ROM, but I'm rooted, have a few bloatware apps uninstalled, and have TWRP recovery installed.

If I wanted to go back 100% to unrooted, unmodified stock as easily as possible, what would I have to do?