So - I spoke too soon. For the last few hours I've been trying to get the Moller full after it "spontaneously" lost level. I opened the JT to 100%, and the best I could do was basically maintain the level at 65%. After monkeying around, opening the warm return a couple times to try to recover, I eventually ended up down at 30% or so. Robert from cryo boosted the flow, and it looks like I am slowly recovering, although the JT is at 100%. For now, my goal is to try and recover, keep it full overnight, and try to understand tomorrow what the trouble is. I still have not tried to ramp up the solenoid, and there is no lead flow yet.
Figure 1
