The Pep Boys _ Manny, Moe & Jack, an auto parts chain founded more than 90 years ago, has agreed to be taken private by the investment firm The Gores Group for about $791 million. The $15 per share offer is a 24 percent premium to Pep Boys' closing price Friday of $12.08. News of the acquisition sent the Philadelphia company's shares up $2.82, or 23.3 percent, to $14.90 in morning trading on Monday.