scantronic 9800 alarm a reply will be given thanks?

Howdy, I own a pub/ pool hall upstairs and I'm having trouble with alarm going off at early hours in the morning when I arrive there I either have zone 2 3 or 5 that have caused an alarm zone 2 is the main pub room zone 3 is the basement and 5 is the landing it's mainly zone 2, now first can I just say everything on the alarm works the two big old bell box's outside work fine very loud with a red flashing l.e.d on both strobes work great and the old sirens the battery was replaced off a friend 3 years ago ive powered it down but the bell box's started to sound one still very loud but the other was much quieter so I put it straight back on but it still hasn't sorted the problem now feel free to disbelieve but I have been told Los rro stories about the pub being haunted hence it being a Victoria grade 2 listed building just a thought to why it keeps happening ha

I've been told off a few people who know little it's a good panel and the outside box's shouldn't be working due to there age so I'd like to keep it running any answers will be much ky appreciated