The siren was behind and above the front left wheel behind the plastic wheel arch. Easy to access and remove, once you find it!
I opened the siren (metal type) by a quick grind on the spot welds and a tap with a punch. Jimmied the plastic siren out, cracked it open by tapping around the seam with a knife and replaced the 2 x aaa cordless phone type batteries with new ones. I had to splice the cables as I couldn’t match the connector. Easy refit.
I now have silent alarms with flashing hazard lights and still have the Alarm System Service Required error message. Could this be an internal sensor issue, I wonder…
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