Is there any known problems that is associated with extensive wear in the housing of the 9550 combines? I have not had the machine for too long and already i notice a large amount of wearing occurring in the housing such as holes, and the auger in the housing. There is hardly anything left to wear and I am wonder how this can happen so early in the machine's life. I am thinking of getting a 9560 series to replace my current model that could possibly be built better. Any suggestions?