The shift was dedicated to the reinstallation of the Squeezer Box ( see entry #49745 ) and Green beam alignment on West arm cavity ( carried out by Tacca and Leroy ). To allow this last activity a lock of the West cavity was required; luckily the alignment was still good after the weekend and we were able to lock it at the first attempt.
The SQZ and ALS activities continued during the afternoon. ALS alignment still in progress.
At 13:45 UTC the ID loops of SDB1 were opened by the Guardian. I tried to close them, but this action seems to excite the Local control of the bench. Thanks to V. Boschi the loops were restored at 15:05 UTC.
During the weekend the SPRB Vertical correction decreased below the safe threshold. From around 8:40 UTC to 8:55 UTC, using the related motors, I returned the value around zero.