Battery drain - what is causing it?

[Dschubba]

Correction vin was 21170 approx with an R for 2024

 

[onuraiu]

Update to my "case", today is 25th of July and dealer measured (my Victron totally disconnected):

So 5 days ago those numbers were:
main: 12.5V
aux: 12.84V

Now those are:
main: 12.8V
aux: 12.39V

meaning, main battery went low and was charged from aux.
main: 12.5V +0.3V -> 12.8V
aux: 12.84V -0.45V -> 12.39V

To sum up, according to dealer that is all OK and nothing is wrong.