If all the cables took one route then anything is possible
If it were me , Identify zone 1 and see what the equipment is at the other end
Defaulting is good , but now you need to set each zone attributes
Hence why I would link out all the zones and trace them one by one and clear each fault
And that's once I know the panel is clear of all faults
I can't remember the panel much , but I assume it was a global tamper so loop that aswell
Does the external bell work?