Update on the water damaged pixel xl from my post in the general thread:
"I have good news, I don't think the company I sent the phone to did jack. The phone didn't look any different, even though they did a lot of work to the phone. I got the phone back today, I plugged it in and still nothing. I wanted to see for myself what was inside (ifixit wasn't enough). I tore it apart and did not see any corrosion. The water sensor is visible when you take off the screen through the mid-frame. It was 3/4 tripped (1/4 was still white). So I tried unplugging and re-plugging everything in. I plugged the charger in and the screen lit up with 0%. The phone didn't charge up after a while, even with the screen still on. I did the water recovery on the board on the bottom with the charge port. Next I only got a blinking red light and no screen lit up. I let it sit for 15 min. Tried turning it on, nothing. So I help down the power button while unplugging and plugging it in multiple times, and voila it turned on! Everything works on the phone! So I put it back together, put 3M industrial adhesive, and it is currently under clamps.
TL;DR I did my own water recovery on the phone, and I got it working!"
I did not find a replacement board, so much for modular replacement parts. I can only find screens. It doesn't help that the phone is so back ordered. Maybe when things tone down, we will see replacement parts.