Interior lighting and door switches

[Shel155]

Hey all, first post here. 02 S8, recent purchase, po did NOT tell me about the drains, so I soaked it. All drains clear now btw but I've got glitches. Drivers door always indicates correctly on the open/closed screen, pass front door always "open"... but the two rear doors indicate open or closed only as a pair, and it fluctuates every day or so, lately leaning towards "open"- both always the same. Other issue is my auto-on interior lights were working for a while, then worked only in ON position, now they won't work at all and that i think is all interior lights, I did change the switch btw. Dash lights/instrumentation and climate control lights all good, also the overhead light switch itself if lit. Question is, what sort of connectors could have been messed up that would cause this, and are there any "control modules" that could have failed due to moisture contamination? Thanks!