[Kjesse]

The condo building as a whole has insurance, for which you pay the premiums through your condo fees. As a unitholder you should also have separate insurance. If you do, call your insurer and let them take care of it. They'll send someone to check as to what you're being told about the cause of the damage.

If you don't, and since you didn't obtain any documents relating to your investment, tell the condo board you expect the policy you pay for as part of the condo fees to cover any damage to the common area.

Since you don't have any of the important documents relating to your presumably expensive purchase, and you're asking about something that is a legal issue depending on those documents, on a message board of all places, the best you can do is take a position and see what happens. At the same time, yes get your own plumber to provide a separate opinion.