Chrysler Group LLC reached a key refinancing agreement with lenders on Friday that lowers interest costs and loosens some restrictions as it paves the way toward further integrating with its parent, Fiat SpA, Dow Jones Daily Bankruptcy Review reported today. Chrysler said on Friday that it had refinanced a $2.9 billion loan and a $1.3 billion credit line, a move that will save it about $50 million a year in interest payments.