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My guess, and it's just a guess, is that the problem lies in the passenger side door. It seems that for some reason, the passenger door locking latch isn't getting the signal to lock or unlock the the door.
As I said in a similar note, a single beep means something isn't closed. A double beep means something is broken. Most likely you're hearing the double beep because the central locking system module sees that the doors aren't synchronized. One is locked and one is unlocked.
It costs about $500 in parts and labor to replace the door latch. If you can have someone diagnose this more deeply - someone with a durmetric cable or a dealer with a Porsche system tester - perhaps you'll know better which part to replace.
Good luck
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