Not sure if anybody here is a repair wiki editor but
https://repair.wiki/w/MacBook_Pro_A2...w_at_5V_repair

It makes the erroneous claim that "LEFT SIDE TOP PORT IS CONTROLLED BY U3100"

It is not. Just looking at the USB jumper connections on a board View will confirm this, or just remove U3100 and see that the top jack still powers at 5V and the bottom jack is now dead.

Also what does top and bottom even mean when they're both in the same plane. Forward and Rear make more sense.

I've gotten a little further on this machine.
I discovered that the diode drop for PP5V_S4_X_USBC is around .498V instead of .188V.
That would leave me to believe that several of the pins on U3100 may be open or internally something may be open on that chip?

After re-flowing around the U3100 and the area the soda had corroded I was seeing that the diode drop changed to around .336V.
I got the laptop to boot on the U3100 USBC port and got to the log in screen and thought great and left it to charge overnight.

The next day I came in to look at it and it...

Just wondering if anybody has seen this issue. I'm assuming that all of the CD3217's are semi functional for the chips to request 20V from the PSU.

This unit had some soda spattered up into the side vent. I ultrasonic cleaned the board, now getting this weird sometimes requesting 20V behavior, then it goes back to 5.2V ~ 25mA The U3200 jack cycles.
I'm hoping this is just an issue with some components between the TOP Jack and U3100 and not U3100 itself.

Not seeing anything unusual on thermals just some of the power supply inductors getting warm when it's requesting...