I have a frustrating problem with my CAAD10 2012 headset. I recently had a warranty replacement streerer issued after a problem. But since then, I cannot get my headset adjusted properly. I'm familiar with the set up, using the pre-load adjuster first and then adjusting the side bolts. But I just simply can't eliminate play in the headset. Could it be wear on the bearings? Should I look to replace them?

Many thanks, and very grateful for any help received.