I've owned the LC200 for about 7 months. Ever since I've had it, I've alway noticed when riding over bumps, the interior isn't as quiet/solid as my wife's LC200. I finally took it in to Toyota and they said the bracket on the back seat has "worn out" and I'd need to replace it, to the tune of $700. As far as the rattle in the front, it seemed to me that it was just the portion that your back would lie up against that was making the noise. When I asked them about this, they said they couldn't do anything or I would just need to replace the whole seat. So, as you can see, no help. My questions is this. Has anyone ever noticed their seats starting to "rattle" a bit and their interior not being as solid or quiet? If so, what you might have done to fix the problem. My apologies in advance if this has been discussed. I don't interact here much at all.