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after market alarm help

  work for BMW
My car came with a Sigma alarm, wired up to central locking, has a bonnet sensor and interior sensors.
After a guy installed a new car battery in my car, the alarm keeps going off on its own maybe 30 mins after I arm it.

Obviously it's really pissing me off so I have disconnected the negative Part of the battery.

I don't know what is setting it off, possibly a faulty bonnet sensor as the guy who changed the battery might have knocked it.

What are my options? I'm tempted to take it to a auto electricians to disconnect it.