No offense, but it still seems you are in denial to some degree about the A3000 even though you had two blocks replaced? Everyone went through this with you a while back, but there were far fewer A3000s made compared to the other models and since it is the newest model, it will take more time for more issues to come up; however, we have been seeing them arise with a number of people on this very forum. Even on my display, the issue seems to be gradually happening although still very tolerable *for now*.
It could very well be argued that those actually taking the time and effort to have a deteriorating OB replaced (no small task, as anyone with a replacement can attest to the havoc it wreaks on an entertainment space) might be among a relatively small group and, therefore, could be considered an "exception" to some degree (at least as far as this thread is concerned). But the actual deterioration itself and its manifestation is, for all intents and purposes, very much the rule. It's not a matter or "if" but "when". That one actually reports a replaced OB or not (or a Sony-granted LCD exchange) is beside the point.
That being said, my OB replacement is already beginning its decline. It too is tolerable for the moment, but the deterioration is occurring much more rapidly than with the original. Needless to say, I do not envision the July 2011 warranty deadline passing without it either being replaced again or exchanged for what Sony views as an equivalent.