Thanks so much for all of your responses!
I'd already drained all the chemistry and run it with just water in it, after a very thorough cleaning. I kept the lid off and watched what was happening there's no liquid moving over the top off the tanks so it's not the spray bars or the overflow.
We don't use the replenishment module. And I was able to determine that it was fluid from the developer tank moving into the fixer tank during the water test, by filling each tank with exactly 2 liters of water and then draining both after running it (with the lid off, rollers out) for a few minutes. When I drained it there was substantially more water coming out of the second tank than the first, I measured the difference and thats how I got the rate of 50 mL per 2 minutes.
I'll go ahead and try cleaning the spray bars with a bottle brush, it definitely couldn't hurt. Any other idea?
Last edited by mmmdarkroom; 11-24-2012 at 05:56 PM. Click to view previous post history.