In a cavernous and mostly empty auditorium, the Detroit City Council embarked on the first of an expected three days of testimony that it hopes will trace events that led up to its approval of an $8.4 million settlement of two whistle-blowers' lawsuits.Council and fewer than 60 people, including media members and City Hall staffers, listened Tuesday as attorney Michael Stefani said he used references to sexually explicit text messages to persuade Kilpatrick to agree to the settlement after a Wayne County jury ruled in favor of two former officers in the whistle-blowers' trial.