I've searched, and it looks like the serpentine belt. I have 34K miles on it and still under warranty. I saw some people getting it fixed under warranty. Should I try the dealer or get the goodyear belt which sounds like it's higher quality. I'm kind of shocked that GS 400 had that problem and didn't get fixed in the 430.

 

Check the underside of your belt for stress cracks which cause it to lose tension, could also be the tensioner which would be a warranty fix.

 

Hi, dealer change my serpentine belt at 18K miles. Your's still under warranty so let's dealer do it. Why pay if You don't have to.

 

Agreed...Mine started sounding like a stuck pig at 30k and dealer replaced under warranty

 

imho, if it's something that you are sure about what's wrong (try to check on teh belt to see if it's bad already), just go in for warranty instead of tryign to fix it yourself