While I was at ISCT1 to look at the green Y beam DC detector, I found two things:

1. COMM beam (SHG beam in reality as X was not locked at the time) was clipping at the top edge of the COMM BBPD. I tweaked the steering mirror in front of the BBPD to lower the beam a bit such that it doesn't clip.
2. Green Y transmission is almost (but not quite) clipping at the left edge of the BS that splits the beam to DIFF and DC/Video. I did not do anything because fixing this means redoing X-Y alignment, but the beam might clip depending on the arm alignment.

The first picture is the COMM BBPD before. Though you cannot see the diode edge, you can easily tell that the beam is close to the top edge of the can.

The second picture is after the adjustment. Seems like I could have lowered it more.