I have an 08. purchased 7/07, rode it a lot during 3 winters in Va., and it did see some salt.
it is my opinion that your bikes paint was compromised by contaminants on the metal, prior to painting.
I would ask the dealer to document it, get Kaw involved, and have that cover replaced. It is a warrantee item when a corrosion below the paint, which opens to atmospher and WILL continue to worsen, requires intervention.
here's my bike;
I do have some "roughness" of the material sub paint, but now openings, or corrosion, and my paint is adhered well, so I don't have issue.
The Green you see on those bolts, and you can see it on mine, is from a marker they use during assembly to mark fasteners as they torque them, it is basically a sponge with ink, inside the socket of the wrench, which deposits the ink onto the bolt head for visual verification during QC.
I noticed this when I went over the bike top to bottom and checked all the bolts, as per the owners manual, @ 500 miles. I did clean a lot of them to remove the ink, but you can see I missed a spot on one... oooops.
The clutch cylinder is below the assembly, so brake fluid ain't the issue, and also, the sealed batteries have no vent to drip there, although we have documented many, ok maybe not many, but a lot, of instances of the OEM 08-10 batt's venting around the negative terminal, and causing fluffy corrosion there, this was localized, and does not migrate down to this area.
this is the battery Mung
Hope this sheds light.