The IFO has been locked in low noise for ~7 hours now.  However, from 15:58-16:33 11/28/16 UTC (7:58-8:33am PT just this morning) the flow signal dropped down from 3 to 1.5 and then recovered back up to 3.  The lasers kept on chugging through this.  This caused an alarm to the operator who notified me - upon inspection, I see that chiller is still reading 4.0 flow at the chiller.  So all seems ok right now again...