replacing texecom

[timmo]

I have a texecom premier which has alarmed but I cannot re set it as it looks like it may need an engineers code. Is there some way of re booting it to put it back to factory default codes. If not, rather than call out the alarm company is it possible to just replace the control panel. Do I need to replace the local lcd keypad as well. If I disconnect the control panel to replace it will the external siren go off? Regards