Hello! My 08 Prius with 35K made strange creeking noise when driven over bump or dip when it 's cold. The dealer have had the car for 4 days and they said the noise came from bad control arm. But they told me they cannot start working on this until they communicate with Toyota about the case. They said "bad control arm" rarely happens on Prius and they will have to "register with Toyota" before they can fix the problem. I don't understand. They are authorized Toyota dealer. And control arm is just a part every car has. Why they have to let Toyota know before they can fix my car? Thanks!