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Remove R6934/5 and check L6900 output voltage.

I don't suspect 3V8_AON spike, as you didn't replace anything from its power supply. Possibly damage caused by corrosion. If 3V8_AON is stable now, check U8100's LDOs.

Not sure, RN008/9 may affect somehow.

Do you have short to ground on that line? Try to clean the hole, without damaging inside layers; may be impossible...

What is PMU_ONOFF_L voltage (without pressing the switch)?

So the board doesn't really boot. You can try known good BIOS; make backup first.

Are you sure no traces damaged in that hole?

Disconnect Touch ID and use a switch soldered to PMU_ONOFF_L.

Did you look on both sides of the board with thermal camera?

What is the current consumption with charger alone?

Yes...

Always allow 10-15s before checking in diode mode, or ohm scale. Did you maintain the position for U3100/200? Try reflashing corresponding TBT ROM; make backup first.

Just for test, bypass R6950 pads.

No data there for your board. I gave you the main link; try to find a similar board in the list, with available readings.

Just in case, check at LP800 too. If no low readings on secondary coils, then is safe to inject voltage on PPBUS_AON. As always start with just 1V, increasing slowly and looking at the board with thermal camera. Set amp limit to 3A, should be sufficient; also remove CPU heatsink. 0.012 is not...

Tested with 96/140W charger?

"check diode mode to ground on all small coils around both PMUs (U8100 & U7700)" No need to apply power for that! Use similar board as guide to make an idea about diode mode readings on the areas affected by liquid. https://openboarddata.org/

U5200 must generate 12.3V at C5250, with F5200 removed. Post its basic voltages.

Not worth to replace; is paired with CPU. WiFi/BT ROMs are now included into CPU...

So you don't get low reading between any coil and PPBUS_AON. You can resolder the main fuses. A working board can help to compare all the readings. Now check diode mode to ground on all small coils around both PMUs (U8100 & U7700). Which areas look affected by liquid?