Try CHA STEN.
You can move stations to unassigned ports, but not simply swap them. If you are looking to swap two locations, you need a third unassigned port. Move ST 1 on EN 1 to unassigned EN 2, move ST 3 on EN 3 to now unassigned EN 1, move ST 1 on EN 2 to now unassigned EN 3.
If you are on site, experience suggests it's much easier to swap the cross-connect.