If there are only two PIRs & it is zone 8 that is triggering then you will probably find that zone 8 is a tamper zone. It could be the panel tamper , the external siren box tamper or it could be both. I'm guessing it is the external siren box tamper. Moisture often gets in the switch & causes corrosion & false alarms. If the box is WELL out of reach it could be discarded , otherwise replace the switch.
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