Upon returning to locking, the first oddity to note is an odd ALSx.

The green X-arm locked up fine, but it had a visible oscillation which showed up fairly big, and then became smaller (see 1st attachment). 

• Frequency of oscillation seen in arms:  ~0.70-0.82 Hz (see 2nd attachment)
• Frequency of oscillation seen in ALSx-WFS_DOF_P:  0.36Hz (see 3rd attachment)

Decided to stay at LOCKING_ARMS_GREEN for a while (well, actually I couldn't move on Thinking something was swinging X-arm, I scanned SEI & SUS screens and did not see anything notably amiss.  It seemed to go away, but after about 10min, ALSx seemed to get noisy again (see 4th attachement). 

Moved on and hoping for the best.