Expired smoke alarms

Hi i’m in NSW. I am having the most difficult time trying to get an expired smoke alarm replaced. Every piece of info online completely contradicts the next regarding owner vs OC responsibility.

I tried to get our caretaker to do it thinking I had to organise and pay but he said they were all expired across the complex and strata needed to do it. The committee flat out refuse to replace them and strata manger won’t respond.

The basic facts are:

it is hard-wired with battery back-up but NOT connected to fireboard/panel.

The building was constructed in 2005 and alarms have 2005 written on them. Someone told me if they were installed at construction, OC is fully responsible for maintenance and replacement after 10 years.

Fair Trading have told me OC is fully responsible if we have adopted their Common Property Memorandum. I cannot find this out and have asked and tried to go through paperwork to find out. What is the best source to find out if we adopted this?

Every other source I have found says I have to do it but no-one I call is willing to come out and touch it.

Can anyone give me 100% confidence on where I stand? Is there someone I can “dob” them into i.e council?? I don’t want to go mediation – I do it all the time and they just refuse to turn up and I lose a days pay every time. There has to be something else I can do.

If its  a murky area should I just wait until they organise the next yearly fire inspection and tell those guys to check the dates. I’m surprised we have compliance certificates with out-of-date alarms..

Thanks in advance