Around 11h20 UTC, I asked Francesco to go to WE building to switch off the PCal laser (the on/off key  and on/off manual switch). During O3, the PCal drivers had to be repaired twice, both times after sudden shutdown of the mains, let's hope this will not be the case today again.

In the future, we probably need to systematically plan to switch off the PCal laser driver when there are interventions on the UPS/IPS of the end buildings.