Kyle, Gerardo 

Our X-end pressure has been higher than nominal following activity in September 2014 which required cycling GV20 -> Data virtually mimics issue LLO had (has?) at their X-end station (see G1500110-v1).  As such, we had intended to spray helium on/in/around GV20 today but the VE configuration is not good (we are open to the BT) for the anticipated leak size and we also have been lead astray by the response of tightening the Vent/Purge valve which should have 1-liter of "rough" vacuum on the other side of its metal seal.

PT510B responded and the X-end pressure went down after we tightened the Vent/Purge valve -> Tightening this valve a little more resulted in a further pressure reduction -> I don't like looking at the visible "gap" on the conflat joint as I am torquing this valve knowing that we are open to the tube so we stopped and went looking for a torque wrench and the specs. for this valve -> We will continue this investigation as commissioners permit.