There is a new Lights Out Management (LOM) firmware available for the Xserve. This update requires Mac OS X 10.5.6 and will take about two to three minutes in addition to a quick reboot. While I cannot look at the files and other items it changes (it’s firmware and doesn’t get picked up by snapshoting tools, I would recommend running it when possible. For more information, see the Apple KB article on the update.