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The sources files for PR2 repository are in /etc/apt/sources.list.d/
When the ROS packages site moved to OSUOSL last year, Willow lost the ability to update the PR2 repositories hosted there, so the PR2 packages were moved to packages.willowgarage.com, and a redirect was set up to redirect clients from packages.ros.org/pr2 to packages.willowgarage.com/pr2 .
I'm not quite sure what has happened since then, but it looks like redirect is still in place, redirecting you from packages.ros.org/pr2 to packages.willowgarage.com/pr2, and packages.willowgarage.com is offline, which is causing the error you're seeing.
You should contact the PR2 support team directly about this.