Looking at filter cavity transmissions, they have been dropping over the last two months (see first screenshot, FC TRANS C is green, FC TRANS D is IR), green has dropped by about 60% and IR has dropped by about 30%.  I'm not sure if this is related to the low frequency noise that the squeezer is adding to the IFO or not.

Minhyo and I tried moving the offset on the green trans QPD while the IFO was locked. By changing the yaw offset we were able to increase the IR transmission, but not the green as shown in the second attached screenshot.  The green transmission seems to be changing independently of our offsets, which looks like part of a diurnal pattern. This seemed to have no impact on the SQZ BLRMs or the range before we lost lock for an unknown reason.