I had a similar problem with a BMW I used to own. 275mA is too much of a current draw - if you go on vacation over weekend without your car, you're likely to find the battery dead.

The problem in my BMW was a glove box light staying on. I fixed the switch and it solved the problem.

Troy looking at whatever is connected to the 2 fuses that you isolated. 90 mA sounds like a much better current craw, althought around 20-40 would be better.

On a cold morning in Scandinavia, even 90mA might leave you with a dead battery.

Troy
1995 E420 80k miles