Fault with Scantronic 9752 (Cant stop alarm after setting off alarm)?

Hi,
I have a scantronic 9752 and when the alarm is tripped by any means I can reset the control panel but cant stop the alarm? It goes off for 10 mins then stops itself.
Recently did the pin short to get the engineers code re-set. I think this may have coaused the software to go boo boo.
Thanks,