After the TCS was switched off (apart from the CH) we procedeed with the recovery of the ITF.
The phases were checked and Diego found that for PRCL a pi had to be added wrt the phase in the central interferometer.
We experienced some unlocks during the engagement of the SSFS (oscillation at 50 Hz) which were cured by tuning the cali SSFS from -3300 to -4000.
Once locked in CARM NULL 1f, we observed a 2Hz oscillation due to SIB1 ty, which disappeared tuning the PR X gain. At 19:38 UTC we closed the CARM2MC loop. (Regarding this first part of the shift maybe Diego will post a more detailed entry).
Then I tried to adjust the phases for the SR (sr tx b1p dcp phi0 from -0.8--> -0.7 and ty from -1,1 --> -2.5) and the SRCL set loops (os phi from 4.55--> 1.4). However once I closed the SR angular and the SRCL SET loop I saw that the SR TX MAR moved by 1urad and the OS went to -10, so I opened again those loops but it was too late and the ITF unlocked at 21:57 UTC.
I leave the ITF in autorelock carm null 1f (but with both SR angular and SRCL SET loop commented, to be better checked tomorrow).