We put the OMCS baffles back on except the -Y side vertical panel, which had a non-standard screw/washer/O-ring configuration. It turns out that that was done intentionally back in Aug/2016 because otherwise the OMC trans beam won't come out of the shroud hole (alog 28944).

The shroud panels had finger marks from gloves as well as spots that look like dust particulates (1st attachment). We wiped using IPA and wipes, which reduced the finger marks (2nd attachment). Though they look much better in the picture, in reality we might have been just spreading it over the larger surface. Some spots didn't move at all. Anyway, we cleaned the panels using ionized nitrogen gun (for particulates) immediately followed by alcohol-wipe.

There was one particularly bad spot, see Betsy's picture.

3rd and 4th pictures show Rahul and Betsy working on a small horizontal top panel. 5th picture shows the OMC surrounded by the shroud panels.

After attaching the shroud panels (except for the -Y side vertical one), we found that one of the white DCPD cables interfered with the top glass panel, so Betsy pulled the cable up higher in the cable retainer attached to the suspension cage. PZT cable was really close to the other DCPD cable, but the PZT cable doesn't have a retainer, so I bent that cable to form a large arc to avoid interference. On -X side, Rahul found that one of the QPD cables is very close to a BOSEM cable, so he worked on that.

These resulted in some change in the OMCS alignment, and top osem numbers shifted according to Rahul. My hope is that this is benign enough we can take care of that using mostly OM2 and OMC.

Rahul measured the TF for OMCS and they're OK.

Tomorrow we'll attach the remaining panel, recenter BOSEMs for OMC and OM2,  and I'll start the electronics check.