Hi Ken,
I would suggest performing your repairs during reasonable working hours, as per your local Council Requirements – usually no works to be carried out between 10pm until 7am Monday to Friday!
Again, if an owners tiles have been damaged by a failure in the common property… your OC should pay for common property repairs and any subsequent damage caused to your private property (tiles, grouting, plumbing, membranes etc.).
If damage caused to your tiles was due ‘solely’ by your tenant / yourself, then I would suggest you cover those costs and maybe seek those monies from your insurance if you have any.
If your neighbour was verbally abused by another owner; tell them to report it to the OC (so that they can issue a notice for the same by-law breach you already mentioned).
Alternatively, they can call the police or your local council so that a warden can attend your scheme if the situation affects the general safety of (all) other residents.