I am back in the darkroom after several years away, and am hoping that someone can give me some advice about a repair to my Super Chromega D Dichroic II 4x5 Lamp house. While troubleshooting the lamp house I discovered that the yellow filter has become unattatched from the Filter Holder assembly. I retrieved it from the bottom of the lamp house and now need to know how to reattach it (or if I can even do so!). The Cyan filter is also missing, but since I am only using this enlarger for B & W printing, I should only be needing magenta and yellow filters. I'm not looking forward to taking this apart. Advice will be very helpful.