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I'm certainly no expert as I have my own issues that remain unsolved. A relatively easy thing to check may be the alarm horn on the right side of the battery when looking from the front. Maybe try unplugging it and seeing if the noise continues. I can't think of anything else that runs while the key is off.
It's probably not the cause, but it should take under 2 minutes to check.
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1997 Porsche Boxster
Threaded Mode
