Attached are the PSL Laser Head flow rates for the last 3 days.  On 7-22-2017 at 15:45 UTC (8:45 PDT) all 4 heads saw a drop in flow of ~0.03 lpm.  This lasted for ~2 hours, and then all flow rates returned to normal.  None of the other flows or pressures showed a change at this time, so it is unclear what the cause was.  The flow reading from the Head 2 flow sensor continues to have periods of noisy readings, which has been the case for this sensor since it was installed.