Shortly after the Apollo crew torqued the "big end" of the new aLIGO GNB-sourced spool installed in place of BSC6 at the Y-mid station, I began pumping the annulus volume using a small turbo hung from the spool's pump port and backing this turbo with an aux. turbo pump cart.  I will log the pressure information at the 24hr mark.  The pressure has been falling predictably for the initial 4 hours.