XP95 Zone Monitor Internal Fault

Hi Chaps

I have just taken over a site with a Kentec Syncro with Xp95 detection in the landlord areas and zone monitors for each separate office.

1 zone monitor is showing an internal fault.

Is this a fault with the zone monitor or a fault on the zone.

I think its the monitor but don't want to waste time trying to locate it only for it to be something else.

Cheers