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..you could also test for induced induced AC voltage across 12v and earth at panel, should not be above 1.2 AC volts. Battery backup failing can drag the system voltages down, if the pir voltage gets below a certain threshold, it'll play up...(but 13.8v at the pir is more than enough) usually...

You don't need a PSU zem, just a wireless zem for the wireless. You can wire two cabled SAB's.. but one should be set to SCB mode(runs off the battery on SAB when active/sounding)- but as you have a wireless zem- wireless SAB's are an option. I know it's an old thread, just thought I'd add input...

if all wireless devices are coming up supervision fault at the same time, and it's had it's device batteries replaced regularly, then the panel is at fault and will need replacing.