Just in case the laser trips, would the person bringing the laser back up please make a note of the status of the laser and whether or not the chillers are running. On the PSL Beckhoff computer, hit the "Stat>" button located towards the bottom right of the main screen (the one with the schematic of the laser drawn). The next screen is the System status screen. Make a note of whether just the "Interlock OK" field, located near the top left hand corner, is red. Or if all the fields on the left hand side is red. Also please make a note of whether or not the chillers are running.