Write a letter to the manager requesting that he comply with Section 62 of the Act (all common property must be maintained in a good state of repair.)
Point out that the areas in question are not in a good state of repair and ask for a date that they will be rectified.
If he does not agree, lodge a complaint with the CTTT. The first thing they do is order mediation, so it brings the matter to a head. The mediator (who only comes in after you have tried to reach agreement on your own) will tell the manager in no uncertain terms that he has no choice but to comply with the Act. It is therefore very unlikely to go to a full hearing.