Dara Torres, the 41-year-old American swimmer who won three silver medals » 8/28/08 9:45am 8/28/08 9:45am at the Beijing Olympics this year, is set to undergo to repair her right shoulder. Torres developed a degenerative arthritis problem in her acromioclavicular (or AC) joint in 2007, but she put off surgery in order to compete in the Beijing…