Cold box pumped out to ~ 190 mTorr overnight.Leak checked the pump again. 
Still leaks at dip stick.Tried resetting the o-ring on the dip stick. It 
still leaks baddd!!!
Machined the old seal off and installed a smaller o-ring onto dip stick. 
Installed 60 ml of new pump oil into pump. Pumping down again. 
After 4 hours the cold box is down to 160 mTorr.