The Bruins were back at work Monday morning as they held their first practice since sweeping the Flyers in the Eastern Conference semifinals with a 5-1 win in Game 4 Friday night. The Bruins still don't know when they will begin the Eastern Conference finals against the Lightning, but they do know that there is a very good chance they will do so without the services of their leading scorer in the playoffs, center Patrice Bergeron, who is out indefinitely with a mild concussion suffered in Game 4.