AutoZone (NYSE: AZO) is taking positive -- but tiny -- steps toward the improved operating results that its management has targeted. That was the key takeaway from fiscal fourth-quarter results this week, which showed faster sales and improved profitability that nevertheless translated into flat or declining market share for the auto parts giant.In a conference call with Wall Street analysts, CEO Bill Rhodes and his team discussed the key factors behind that competitive stumble while seeking to assure investors that these issues shouldn't impact results going forward.Below are a few highlights from that presentation.