It might be time to start writing letters to JD before it is out of warranty.
If your terrain is so rough - perhaps you should consider a rear finishing mower.
D.
I did talk with JD 1 800 # said its up to the field rep what they are going to do. He said if it fails again they would determine if "HE" wanted to cover it under warranty.
My yard is not perfect but it is not even close to rough. It has been tilled up with a 5' tiller behind a 3000 Ford tractor and reseeded about 8-10 yrs ago.