Financially strapped Sirius XM Radio said Friday that it could file for bankruptcy as early as Tuesday if it cannot successfully negotiate with the holders of its debt. The satellite radio company said it has exchanged $172.5 million of debt maturing in December for new debt due in 2011. But the company still has about $175 million coming due this Sunday. Sirius is fighting against attempts for control by Charlie Ergen, the chief executive of Dish Network and sister company EchoStar ........... continued at: http://www.cnbc.com/id/29180199