Saw the corner station pump output at zero with max drive from controller.  This condition usually indicates a level trip.  At Pump Stations on mezzanine, indications confirm.  Plus when I attempted to restart, it tripped again from fluid level so I conclude it was a level trip fault.  I lowered the trip point to compensate.  There is only about 3/4" more this can be done.  Why...colder temps? Nah, likely a pretty small effect, air bubbles working there way out?  Probably some of that going on; if it comes out of the LVEA plumbing, it can be released in the reservoir tank.  Leaks?! There are some minor leaks from two of the pumps but these are a drip or two a day kinda leaks, certainly contribute though.  Bottom, line, monitor the levels, clean up the leaks, fix the leaks, add fluid as needed.

I took the opportunity of the shut down to hardwire the FWD switch on the PS controller.  This is already the case at the End Stations.  Consequences: 1) After a shut down, there will be no need to open the panel to restart unless there is a fault to acknowledge on the controller.  This is good because access to the panel requires electrical checkout/approval from McCarthy or having McCarthy do it.  2) Restart will be abrupt if it is not brought up slowly (manually).  This could be bad as the HEPI may shake things around so please understand the process when you restart the system after shutdown.