Man, I have not thought about one of these for a long time! Was the first IM I had the chance to work on. Had water cooled condenser and would not harvest. Bad condenser water valve. Fun to watch them work and so easy to clean. One tech said he kicked the voltage up from the (i think) 5 volts to 12 volts and made it really chew through the slabs.
Before it dies and /or gets scrapped, you should do a you tube video of it in operation for posterity. I wish I had vids on some of the old stuff I had worked on to show my students.