My Z3 has some green spots that were a factory flaw (I noticed them after the first few viewings), and I am just at a point where I had time to get it sent in and fixed. Basically it ended up being some dust particles stuck in-between the lenses where the "end user" (me) can't clean without voiding the warranty.
Anyway, Sanyo arranged for the overnight shipping to them, they "fixed it" in one day and are overnighting it back to me. Great service! It will be back on Monday, so we will see if I get my same unit back, fixed, or if they kept mine and sent me a refurb. As long as I still have 2 more years of warranty, and I don't have any problems, I don't care (and as long as the bulb has the low hours on it like mine did)....
