guardtec 300/500 series?

just got a cat and want to zone out a section to prevent the cat setting off the alarm.
Used the removing zones on setting option, but i guess
the zone i removed was an entry point and the alarm, goes off every morning.
Guess i need to re-program the unit but have no engineering rights,
I am not prepared to pay an engineer to do a job that i am more than capable of doing myself (the system is old and i would rather get a new system if worst came to worst)
So does any one have an engineers manual or codes for
guardtec 300/500 series