At ~0946 I valved out the South Actuators on BSC2.  There was a little pressure bump at the Pump Stations but I didn't see any HEPIs trip from that.  The Valve has been replaced and in is bleed mode.  The valves to the South Actuators were reopened ~0907 but I couldn't get the Mac Air to come alive to watch.  Looking back at the trends (attached) the reopening was worse than the closing.  I haven't heard any complaints but certainly those HEPIs under position control may have seen a wobble.  I opened and closed these valves very slowly to give the servo time to keep up but obviously even slower is better.