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Hi,
You need to measure the current to try to isolate it. Although, identifying which fuses have voltage with the ignition off is a start. As Leon said, pull each fuse. Get a multimeter with a current measuring function and put it in-line where the fuse was.
This would help identify which circuit it is. Then after that is known, you can look at the schematics to see what is hanging on it and then try to isolate it down to some culprit. Also check to see if anything is spliced into the battery at the plus terminal in case there is something else not stock that is bringing it down. These things can sometimes be pretty tricky to solve.
My 960 battery dies in a month if I don't drive it. I am thinking that it might be an older battery in my case.
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