We had the same problem, but that was 9 years ago. It basically shook it self apart and was ready to fall off, luckily it was in for a greenlight before any major damage happened. They have an update/replacement parts for that specific problem. Not sure if they will cover the expense nowadays, but they did for us back then.
Aside from the normal stuff, thats the only thing I would be looking at in particular.
Basically the same combine, except the concave, more lights under shields, light for the sieve area, and I think 275 h.p. instead of 260. If it has the sunnybrook cylinder in it, it would awesome compared to the 9600.