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Seems like the mechanism is put together with Torx screws. I would open that thing and inspect everything.
Your description sounds like the is a bad solder connection or a bad or corroded contact. So i would inspect the wiring, the contacts and the solder points. Of course it can also be a bad micro switch.
If you have Piwis or Durametric you can check the M535 for DTCs so you know exactly what causes the double beep of the alarm horn.
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