Interesting.
First, read this letter. Then save it, you'll probably need it.
Ducati has already faced-up to the problem and say they will replace failed rockers, even on bikes beyond the warranty period. (But not if the repair is made by a non-Ducati shop.)
The lesson to be learned here is that you should assume that either your rockers have flaked already, or will in the future. So to avoid this hassle, if you have a bike under warranty, you should have Ducati do the valve adjustments and instruct them to pull the camshafts at the first 6,000 mile service, and particularly, at the last service before the bike goes out of warranty. You'll have to pay for the extra labor cost yourself, but it's worth the investment.
The only real way to know if your rocker's chrome have flaked and damaged the camshafts is by removing the cams from the heads for inspection access.
However, you can't withdraw the cams without sliding the opening rockers back and down out of the way first. So, you have to pull out the opening rocker shafts about a half-inch to slide the rockers back and out of the way, and then rotate the cam as you withdraw it along with the bearing housing.
Removing the rocker shafts is not difficult once you once you have removed the drive belts and rocker shaft cover, etc. It is the only way to really get a good look at rockers. Just don't pull rocker shafts out more than a half-inch. If you pull rocker shafts out too far you'll unseat the closing springs making it difficult to reposition them. A half inch is all that is needed.
I'd like to point out also that there are alternatives to replacing your rockers with equally defective Ducati OEM replacements. Megacycle will re-face your rockers for around $70 per rocker. BCM has a similar offering, as does Guy Martin of MBP for $45 per rocker.
http://www.mbpducati.ca/ http://www.bcmducati.com/ http://www.megacyclecams.com/