It’s the BC’s job to maintain the common property and you can submit a motion to the Secretary asking for this repair to be done with a copy of quote (some require 2 quotes). Just needs to be voted on by EC or all owners and a simple majourity will authorize it.
Just need to be certain it is BC reasponsibllity.
1) Boundary fence between your complex and another property cost is split 50/50 between BC and other property owner.
2) Boundary fence between your unit and common property is split 50/50 between yourself and BC.
3) Boundary fence between 2 units within block is split 50/50 between the 2 unit owners.
This is the standard position but their could be something in your bylaws / plans that overide this. You need to check.
If he refuses or vote fails suggest to him you will take action at CTTT as if it is common property they are liable for it’s maintenance.