SBU1 and SBU2 are not symmetric

[robbederks]

Looking at the difference between the measured SBU1 and SBU2 voltages from 1000 C3 segments, it's clear that on the dos they are not symmetrical:

Electrically they should be, so it's likely software-related (pull ups / downs / ...). Doesn't cause issues for the time being, but should be fixed nonetheless.