Per ECR E2600223, a ZV-800 style viewport was installed on the G11 port (+X, +Y, middle port) of BSC2.  The First Contact that was applied after inspection was removed.  No smudges were noted except the outside edge, ~1/4" from the metal flange where the FC didn't cover.

A scratch was noted on the chamber conflat flange (see pic), but the actual knife edge ding associated was very small.