Quote Originally Posted by summicron1 View Post

So, when you say the lens was not completely cleaned, keep in mind that it is not possible to clean the element surfaces that are cemented, and what you may be seeing could be a chemical change in the cement -- to disassemble and rebuild such a lens would cost more than a new lens and you would end up with a lens that was probably not rebuilt with the care the original gnome in Wetzlar used.
Because the lens was returned with a visible defect and NOT cleanable, the service joint should have noted that when it was returned. The shop guy was just guessing it wasn't repairable.