At 20:30 I was informed by Paolo, who had restarted the prealignment works, that one actuator on the WI Mirror did not respond. Probably the magnet detached. Quite strange as apparently no significant shakes occurred through the suspension system. Just to be definitely sue of what occurred, an electrical check on the flange, to see if the coil is connected is worthwhile. We do not know when it happened because it was the firs time these actuators we used (to crosscheck and tune the driving)