After the realignment of the West Arm we tried the lock acquisition. Besides some issue with PSTAB, we unlocked due to the WE violin modes during the transition to LN2, fig.1. 

We looked at the notches in the control filter and we noticed some miscentering of the notches wrt the excited modes. The DARM correction was substaining the noise at those frequencies so we sligthly modified the notch filter in order to limit the modes noise reintroduction (see Fig.2 for comparison)

Most likely the modes will naturally damp with their own tau (6 hours ca).

We leave the ITF in CARM null 1f, with the PSTAB loop open.