I had nightmares last night.
I wonder if that is what is frozen? I don't think I ever bypassed it.
And less than 1 minute with my heat gun later, I learn that it was that thing that was frozen. I should point out, that my heat gun has no asbestos in it! Not that you can quite read that in the image, but it does say it.
Spray foam! Now it's fixed forever.
Tuesday I shall watch a movie.