Same question, are sure it is collapsed?
Are you able to control the Fractionator top temperature?
Can you catch a sample on the top pump around @ the pump? Look at the color and see if it has a yellow tint.
Do you have any condensers in the top pump around system that could be leaking and putting water in the tower?
Any issues with the pump around below the top tray?
Have you had any corrosion issues in the past?