Does a homeowner's association have master keys or a master key to all the houses or condos?

Even if you change your lock yourself, can the HOA still enter? And can they allow someone else access to your condo if you don’t want that other person in your place?

The reason I’m asking is because my HOA is going through some lawsuit with the company that built my complex. And some people want to come inside to our particular unit and do some extensive testing. Taking sample of the drywall and other stuff.

My question is can these people still come inside our unit even without our permission or knowledge to perform these tests? I’m very reluctant to let these people in because they’re just going to rip everything up and leave a big mess.