I had a similar issue in my building the first thing you need to do is get a support group and get the shareholders to take an interest in this shady behavior. unfortunately it cost us 2 years and $60,000 in legal fees to finally get 70 percent of the financials. We now have the majority on the board and we still had to subpoena information from past directors.

If you dont want to spend that kind of money your best bet is to get shareholders to notice the issues and vote them out come election time.