Not knowing what else seems to have been happening it seems as if you’ve made the right moves. The strata manager’s reaction seems extreme and somewhat unprofessional have you had a few more falling outs with her/ him? It’s a shame you did not get support from the other owners.
Firstly re fire I can’t see any issues here unless what has been done does not meet code. As I said before no locks are required to meet fire codes.
Locks, if these were not replaced with like then you have an issue with the strata manager and EC. They are required to maintain and should not be making material changes without permission from the owners. You can formally request they replace them and if they fail to do so you can request mediation. If this is not successful you can seek an order from your state-based tribunal.
With regard to passing a maintenance request to an ECM I can understand that could be normal practice but it would not have hurt to add it to general business. However it is obviously a larger issue now and deserves greater discussion. You can formally request it be added to the next ECM and also attend. You can ask to be part of the discussion but the EC doesn’t need to agree. At least the matter must be formally discussed and minuted. Depending on the size of your building this may need to be sent out to all owners or at the very least must be posted on the notice board.
Good do luck with your security issues. Be careful of the fire issue doesn’t take you down a rabbit hole.