The initial alignment with which we can obtain highest transmitting power for both arms started decreasing just after the locking and seemed to go some constant level as attached files.
ETMY Yaw drift was about 5 micro radian.
ETMY Pitch drift was about 3 micro radian.
SR3 Yaw drift was about 2 micro radian.
PR3 Yaw drift was about 2 micro radian.
Around 5:30 (TMSXY values are max), just after locking about 460 kpc was indicated.
Around 7:15 (TMSX values are about 105/125 for X, 85/100 for Y, compared with the max values just after locking), 595kpc was indicated, however, we should consider the reduction of the optical gain.
Picture with ITM TCam image
It might be due to the offset comes from the DARM offset and A2L coupling. If the beam centering is not enough, the ADS error signal will have a offset, and due to that the TRANS degradation will occur.