I would go it alone. Get copies of everything and then decide if you want to go to a lawyer instead of paying him to sit there. Bringing an attorney to the meeting just seems like it will cost you money you don't need to spend. I would guess the engineers will be providing the results of the test AND proposing a course of action for repairs.
My questions would be:
1. What is the cause?
2. How do you repair?
3. Has the association approved repairs? If not, when?
3. How long will it take?
4. Who pays?
5. Is the association filing a claim for the damages done to your flooring? If so, there's a whole host of other issues that you may have to deal with. (like how will it be replaced, what will they replace it with, who will do the work, who will oversee the work)
It might be worth looking into your Homeowners policy to see if you have loss of use coverage. If you can't live or house tenants in the unit while they are doing work, you may be able to use that. If you (or tenants) can't stay there and don't have that coverage, you're likely going to be out the cost of alternative housing.