The HEPI Pumps stopped due to a level trip in the reservoir fluid height.  I did a 100% scan of the system in the LVEA and found no evidence of a leak.  I should have done similar in the MR but went back to my previous assumption that the fluid level declines were from the known motor drips on PS8 (1.)  I had lowered the trip position to its lowest level last Tuesday so I proceeded to add fluid (Best to do while pumps are off.)  Added ~2.4 gallons and then got the pump stations back running.

It seems someone else had seen a leak on the mezzinine previously--Just before leaving I noticed something (can't remember exactly what) behind the blue drum behind the reservoir, on the floor was an absorbent pad and other puddles.  I first thought TCS but no it was HEPI fluid.  I found a 5 second drip coming from the pipe/hose joint at the electrical break.  I tightened this clamp a bit and will regularly monitor for a few days.  I suspect the leak rate may have increased over time but if it had started at full rate, it would take 105 hours to leak a gallon.  Since last Tuesday, I'd say the level had to drop about 3/8" or 0.3 gallons.  Given the mess I cleaned up this morning, that seems about right.

So, I don't know when this leak started, it may have been much slower for a long time.  Was the absorbent pad just luckily in the right spot or had someone put it there?  Did someone tell me about it (a long time ago,) possibly?