well i wouldn't say it was buggered might have been a 24 hrs zone which the siren tamper was connected to and the siren tamper switch may be faulty or corroded.
you would be lucky to find a sol8 board as they are probably 20yrs old , i would power it back up and see what happens and if it goes into alarm see if any zones other than your normal sensors light up , if there is a zone list on the keypad ascertain what the zone is
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