In her first interview since being fired, former CBS News producer Mary Mapes maintains that her controversial "60 Minutes II" story on President Bush's National Guard service was "true" and that "no one has proved that the documents were not authentic."... In her interview with ABC News chief investigative correspondent Brian Ross, to be broadcast Wednesday morning on "Good Morning America," Mapes says she is unrepentant about her role. "I don't think I committed bad journalism. I really don't," she says.... Mapes says Rather did not have "any obligation to resign" from his position, as CBS correspondent Mike Wallace recently...