My 4720 has a vibration in the steering that creates a whine like noise. There is a technical bulletin out for this noise, but mine already has all the updates. The noise is louder when it is cold outside. If I grab the wheel and keep it from moving - the noise goes away. Oh well, I cna live with it.
I think my battery is leaking also - I see some rust on the front of the frame - where acid migth have leaked. Always something...
D.
