820-00239: PP20V_USBC_XA_VBUS Missing

[macRepairAmb]

Originally came in with the critical update issue. Found minor liquid spill and some corrosion. Cleaned up the corrosion but was still having the critical update. All of a sudden it's stopped point up, come to find out PP20V_USBC_XA_VBUS is missing but all the other 3 ports are at 20v and current draw. Any suggestions

 

[2informaticos]

Compare diode mode readings around non-working port with the other ports.
Start with CD3215 LDOs and CC1/2 lines.

I suspect corroded component, or broken trace.