OK, before I go any further, you might want to consider talking to an experienced strata lawyer (and David Sachs of our sponsors Sachs Gerace Lawyers is very reasonable, in every sense).
I am wondering that since the decision to take out the fire alarms and not replace them was made under the old strata laws, where strata committee members could be personally liable for decisions they made that they knew were wrong, you might be able to take action against them for the difference between the original cost and the additional cost now.
All that aside, you can take your owners corporation to NCAT under a section 232(2) for failure to fulfill their duties and responsibilities, and get orders compelling them to do this. You could also get something done about the rising damp under the same section of the Act.
You’re not going to make yourself popular but it sounds like that ship has already sailed.