sixwheeledbeast

It would likely need an installer reset on any tampers if it was under contract in the past. You wouldn't have the engineer code as an end user. Consider having an installer take it over and service it. They can program it how you want and you have a record it's operational and fit for purpose.

Installer should be able to make the part set silent. Which model Galaxy?

I'd get rid, flaky Risco stuff. But yes it's totally wireless detection so replace devices too.

From what I remember it replaces the banner message with TEST FAILED upon failure, this will display until engineer reset. Not something used often as you loose the detection while it's on soak.

Trail and error to find +ve/-ve, then use meter and further testing on a -ve to locate the rest? A company would decommission the siren and resite at an accessible location, not recommission a box you can't access safely.

Then products are irrelevant, your installer of choice will use their own preferred manufacturers. They will have trained on that kit so asking them to fit something else is not the best idea. You should get at least 3 quotes go with the company you feel the most comfortable with, not based on solely the quote price. I'd usually replace all the electronics, but you don't mention age or models of kit. If it's a really old Premier I'd bin it anyway. 4 zones, 3 sirens and 3 exits, seems the weirdest system in the world...

Where?

If you get the same manufacturer as the panel you will have EOL OOTB. I don't really rate those cheap Honeywells, some nice quads will be much more reliable. Much better down the line to have end-of-line than double pole to diagnose faults.

Should be compatible if you wired as double pole with commoned tampers. I'd probably replace them.

Lidl bakery useful. Aldi don't like at all.

Morrisons is a bit posh for up here... Heron or Farmfoods maybe?

I don't know of any panel that would chime on close. Yep, as above using a Mimic output and some other logic like a toggle relay or custom outputs would be the way to go.

Then I would suggest monitoring in that case.

Like most sounders the Twin alert manual has the wiring instructions for different manufacturers. Aux Tamp / Aux Tamp / Bell / Spk- / 0V / +12V