Pump and purge the IVC with gN2 (at least 5 times). Make sure the pop-off valve on the magnet IVC is closed after each pump-purge cycle, and leave it closed.
Check the LN2 level in the outside tank. Ask Jordan (FNAL) to order a refill for the outside LN2 tank.
Pump-purge the separator space, and at the end of pump-purge cycles, keep the separator pump-out line pressurized and close the hand-valve in the cave.
Pump-purge magnet space with measuring purity at each cycle.
Pump-purge the fridge.
Unscrew run, bypass valves (in the fridge), and take them out. > Blow gHe through it. > Spray dry lube