The Xarm ALS has been a little funky today.
First, the green and the arm-axis would not stay co-aligned. I'm not sure which was moving (although neither ITMX nor ETMX seemed to be moving very much according to their oplevs and OSEMs). I went to the Xend table and jiggled the mounts for the steering optics, in case one was loose or something. None were. However, the transmission quit jumping around by a factor of 2 after that. The beatnote alignment on the PSL table was also bad, so I tweaked that alignment up for the Xarm. There were some not connected cables and fibers blocking the access to the X beatnote area, so those are up on top of the PSL table.
Anyhow, I haven't locked the individual arms, but I cannot hold the lock with CARM/DARM. The CARM output keeps hitting the threshold for the locking watchdog, which turns off the lock. Obviously I could just increase this threshold, but the right thing to do is figure out why the Xarm ALS is so noisy today, and why it wants to output such a large control signal to maintain the lock.