Jeff B. phoned me while I was doing this as he had noticed a very large spike in particulate in the Y-end VEA which exactly correlated with my having done this.  Investigation revealed that the Y-end Turbo's local scroll pump never got a particulate filter installed at its exhaust - Ooops!  -> I located this unit and will install it. 

Also, the chilled water booster pump used with the QDP80 is now leaking at the pump end -> will put this on the list.