The cameras on IOT2L were not focused, and in the case of the REFL camera, the newly installed sutter prevents it from seeing the REFL sensor, so I moved that camera to look at the HWP/CW/2" steering mirror at the back of the table.

In looking at the WFS cameras, both are looking at WFS B, and there was clearly 2 beams when I focused, but our alignment was not set, so I revisitted this yesterday, and the two beams are still there.  See attached pictures.

The source of the second beam is known, the design of the beam dump and pick off just before the beam splitter to the REFL PD are sensitive to alignment, and when the alignment changes enough, the beams that should be picked off or dumped make it through and polute the rest of the beam path.  Attached is an annotated layout of IOT2L.

Unknown how long WFS has had 2 beams, but since we ended O3a, it's possible that PSL and MC1 changes could move the beam on IOT2L far enough to miss the beam dump and pick off.  Attached are changes in the IMC since O3a, and MC1 in pitch is ~8urad, which is about 10mm at the REFL PD beam splitter, which is enough position change to move the unwanted beams off ot the beam dump and/or pickoff mirror.  In the attachment, the beam changes are on the optics, MC1 and MC3.