Without knowing more about how the General Partnership functioned, this is a difficult question to answer. Your inquiry does illustrate the importance of keeping records and have meetings. In addition, even if you are no longer a General Partner, you may have liability for acts committed while you were still a partner. If you have no evidence to document when you left the General Partnership, you may not be able to get dismissed. You definitely want to hire a corporate attorney to advise you on your situation and lawsuit.
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Absent a written record of when the entities left the partnership, getting them out will require some litigation, and its a technical issue you will want to hire an attorney for. Some of the relevant facts will be when the departing entities stopped recieving profit distributions, when they stopped actively participating in the business, and statements they may have made indicating withdrawal. You should definitely consult an Arizona business lawyer to help assess the case.