Getting to understand the personalities and their goals is the first priority. These disputes are usually as much about politics as they are about legal rights. Legal rights dictate the strict position, but pragmatism and commercial wisdom will bring the resolution.
Mediation is a classic method of bringing the parties together to allow a solution that covers issues that straightforward litigation on the legal points cannot cover.
Disputes are often resolved with limited involvement. Speed is critical in these matters as the real business of the partnership can stagnate during the dispute.