I guess they can't get hold of the previous owner to ask for the codes? Do the new people own the system or was it rented?
Some info on their web site but couldn't find an explanation.
Seems Technical Manuals are only available to "PI Club members" and nothing in the user manuals. You can be sure the alarm will go off if you tamper with the alarm box. Specs suggest the battery will power the alarm bell for 30 mins or so if it's ringing.
Perhaps worth giving them a call..
http://www.pyronix.com/contact/uksales.htmDefault master code is 1234
Default limited user code 5678
according to..
http://www.pyronix.com/download1/technical/docs/pdfs/Paragon/Paragon%20Super/Eng...