The auto parts retailer is, yet again, in turnaround mode.Shares in auto parts retailer Advance Auto Parts (AAP -3.24%) slumped by 28.5% in August, according to data provided by S&P Global Market Intelligence. The move comes after a disappointing second-quarter earnings report and a slew of analyst downgrades.Advance Auto Parts' problems continueNine years ago, renowned activist investor Starboard Value laid out the value case for Advance Auto Parts. It was made based on classic value investor principles. F ...