Mine had its first at 40k, its still on its second and I have its 3rd sitting in my garage waiting for a day to do it, I'm probably going to do it in the winter, engine will come out, chains will be done, clutch and everything else at the same time, major open heart surgery.
It could be that its been driven very carefully all its life?
No way to check the wear on a 3200 without taking it apart so unless it feels dodgy there is no inspection that will help in this regard.