I'm in the process of installing a second cls 1000 5x7 in my darkroom. Upon visual inspection it appears as though the clear filter at the bottom of the filter assembly is partially melted. I've removed the dichroic reflector and when I zero out the three color channels and the neutral density I can see the clear filter in question. I'm guessing it's a UV filter. But why it's plastic and not glass is beyond me. I want to get a closer look but it does not look like one can access the filter assembly through the top of the head. I'm pretty sure the innards of the cls1000 are essentially the same as the cls1840 so a schematic for either head would be a great help. Anyone have any clues or suggestions?...