I don't think it's recommended to rev your auto gearbox till such high rpm. It hurts your auto gearbox(and so does your wallet). Auto is different from manual. Unless it's sports tuned auto gearbox, do not try to rev your auto gearbox to high rpm like you do on a manual car..
Btw, just try to file another complain to them, till they check it for you.
This post has been edited by Aquanox28: May 3 2007, 09:25 PM
[WTA] Auto Gearbox In Myvi, Whining Noise when in high RPM