The "power management" system shuts not required systems down quite quickly after engine stop, so if 25milli amps is being noted after 10 minutes then that seems okay to me. What is happening after that is important and trickier to check over a longer period in time, ideally the minimum you would need to do is to stuff a very low value precision high wattage resistor inline with the battery lead +ve or -ve and log the voltage drop wrt time over a 24 or 48 hour period, then after finding that there was indeed a random higher current being drawn, then you would need to split up the wiring system to narrow down which area was causing this
problem, then drill down deeper.
I'd doubt of any main dealer would bother taking that approach!
What I had on a late 2009
Ibiza was a similar situation, I exhausted all my ideas on splitting wiring areas and locating which one was causing the issue, so I handed it into my local SEAT
dealership with the "I think that it might just be the BCM software issue that early 6J
Ibiza were known to have" - they would not have any of that "that is just an internet myth we need to work on facts" - so first attempt of overnight testing/monitoring found nothing - no faults present and no current drain, I told them to keep it longer, next day or day "we found a fault, the steering angle sensor under the steering wheel - (only used on that car to switch on the individual fog light), and we have replaced that and now there are no faults £380 please, so I paid up but also added "why can that affect the car with the ignition off and so the engine not running?" - "oh,that would generate noise in the CAN lines and keep wakening up other systems and so drain the battery" - I said that I did not think that was correct - but they are the experts! A month later with me constantly monitoring the battery using a remote lead and never driving the car, I could see that it was still a
problem, so back to that
dealership, a quick "absolutely no faults and no battery draining was declared after another few days of testing/monitoring!" - so I took it away and started looking further into this and coming up with absolutely no answers other than it must be due to the wrongly programmed BCM which now needed recoding/programming - then I got a letter to say that SEAT garage was closed and so I should head for another SEAT
dealership and SEAT UK would support me! Bother!
So, as that car's owner, my daughter was coming home for Christmas while still working abroad, I booked it into this next SEAT
dealership, when I mentioned all what had happened and my thoughts about it being a BCM S/W issue, the service receptionist took this onboard and noted it down as they had this exact issue with a 2009 VW Polo that they had sold and it was a BCM S/W issue which was resolved by requesting a solution from VW. I handed that car in a few days later just before Christmas and they found no faults so took the next step which was to request a solution from SEAT via a technical request, an answer came back from SEAT directing them to a S/W patch, and so when that daughter left UK after Christmas I booked that car in for that patch to be downloaded into that car -
problem solved, it only took me a couple of years almost!
Now I 'm just repeating that tale to indicate that some times these problems are difficult to resolve, so your first step really does need to be to get that car's systems checked for faults, if none found a dealer should move on to monitoring the drain over a longer period - over night or nights and then moving on from there in a SEAT directed manner - horrible situation to be in, hopefully SEAT can find the root cause quickly.