First, it seems that is a violation of their warranty agreement. I'd read the warranty and see if it excludes the optical block from coverage or get them to tell you where that exclusion is. Just because they say...
Second, that doesn't look like any optical block problem I've see posted.
Third, current models are way better than the Epson, though maybe not for 3D yet. I have an out-of warranty RS20 myself that has developed the dreaded magenta stripe and I'm considering the Sony HW55 to replace it.
So I'd read the warranty as a first step. Maybe they're just saying, "no" to make you do your homework.