Yeah mate it's a known issue and an "authorised kawasaki (recall) repair" if it happens (which means they'll fix it for free).
Mine is an 03/08 and exactly the same thing happened and was fixed. Leaked the oil onto the headers and out through the fairing hole and onto my crash knob.
Call up a kawasaki dealer and tell them what's happening and give them your vin and they'll check the vin range that the repair applies to. Yours should be in the range also.
The rocker cover gasket kit includes some other seals also but I can't remember what they were called.
I had them check and adjust my shims while it was all apart for some extra cash, cost me $100 at the time from memory but it depends how many are out of spec.
Hope that helps.
ps, ask them to inspect your "buckets" while they're at it, trust me on that one, just do it.
