I found the distribution manifold valves closed at HAM3 this afternoon while checking the lines.  I doubt anyone would have operated those valves so I must accept the responsibility for leaving them closed.  This does put HAM3 at some level of risk.  If there were a leak there, it would be below the leak found on HAM4 which at ~120psi was losing about 1/2psi per day assuming I only failed to open them at my last log book entry when the system then endured a week long pressure dwell at 125psi.

Upon opening the valves, I got an air bubble out which tripped the Pump Stations.  Pumped a little more fluid into the system and got it back stable at 26 psi.  The Servo is On and this pressure pushes the drive to 55hz.  Max is 60.  I've done a thorough hands on inspection of HAM3 and see/feel no leaks.  The Mezzinine fluid level is stable.