The turbo pump system at X-end shut down for no obvious reason around midday(?) today -> I used this "down time" do some routine maintenance on the QDP80 backing pump (grease rotor bearings, change gear oil - 400cc Krytox - and top off heat exchanger coolant but these all looked normal) -> Restarted QDP80 and MTP -> I'll leave these running but valved out from the X-end VE for overnight 

Operators Note:  
X-end under vacuum but unpumped overnight, i.e., X-end pressure will be increasing and PT510B value may change from "green" to "yellow" if left this way indefinitely - no action is required.