Limited to a schedule-driven "window of opportunity" we had installed the most recent (3) ea. NEG pumps before having completed all three cycles of a series of steps recommended to mitigate particulate sourced from the surface of the NEG material.  Though installed on the vacuum system, these new pumps were left isolated.  These preliminary steps amount to "activating" the NEG pump while pumping it with a locally mounted turbo, allowing it to cool and then venting it with UHP N2.  Once vented, a blank flange located opposite the port used to administer the vent gas is removed and the vent/purge gas pressure/flow is increased such that any particulate generated on the NEG material surface gets liberated then "blown" out of the pump housing.  

So today, I revisited this task and finished this exercise on the pump mounted closest to HAM5 (we haven't officially numbered the NEG pumps at LHO yet).  I re-installed the blank that had been removed and am pumping with the turbo over the weekend.