Problem solved. I located and removed the security horn. Hooked 12 volts up and no sound. Went to the local Porsche dealer and purchased a new horn for around $20. Installed it and security system works like a charm.
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Chris Dennis, Plano, Texas
'07 Boxster, arctic silver, Tiptronic, 106k miles, no mods
‘13 Boxster S, black on black, PDK, 27k miles, garage queen
‘66 Mooney M20E, hangar queen
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