Hard to say, but my motto is when in doubt, replace. If the rasp bars are that worn, the separator bars are probably pretty worn too. As far as the vanes go, look at them closely, If they are worn down so that they are sharp on the edges, or if they're worn down at the ends, I would replace. They are what makes the crop move rearward, if worn the rotor can get constipated and take more power than it should. The extended wear vanes will last a lot longer and are much heavier. Don't forget to check the T-bolts that hold the cone to the rotor cage, they have a habit of the heads wearing off. Also, check the cone and rotor cage for thin spots and the concaves for wear. Worn concaves will result in poor threshing. Also check_replace the rotor hub, the rubber bushings in it have a tendency to wear and cause some nasty vibrations. Check the seal in the rotor gearbox to make sure it isn't leaking. Replace the front rotor bearing. In other words, it sounds like the rotor hasn't been out in a while, so you should give it a good going over while it's out.