I duplicated the squeak noise heard while driving by rotating the body of the right rear shock, so I assume that is the source. I tried tightening the lower nuts and lubricating the rubber bushings. So far the noise is still there. Does this indicate a failure in the shock, or just that it is not tight enough to resist moving and causing the noise?. (I haven't tried to tighten the upper mount since I believe it is quite involved to expose the mount under the rear seat)