The CO2Y laser RTD sensor tripped and shut off the laser on 19 Feb 17:52 UTC.  We restarted the laser on 22 Feb 18:00 UTC.  The RTD sensor is a temperature sensor mounted on the CO2 laser viewport.  It's pourpose its to shut off the CO2 laser if the laser is heating this vieport. However  I don't think this is what happened here, because now we are using the CO2Y laser to heat the ITMY and the RTD sensor has not tripped.