Terry and Christina got second cleaning taken care of this morning. The ICC crew removed bolts from the dome and the appropriate doors, moved the purge air from HAM-9's west door and attached it to the BSC, and started removing feedthroughs and viewports. Mark asked John to have a look at a couple of viewports that had "discoloration" on them: one turned out to be something on the glass surface that was readily removed and the other one seemed to be a spot where a laser had gone astray.

On another note, Rai and I spent some time in the optics lab looking at a couple of possible methods for documenting/quantifying particulate depletion on chamber surfaces.