Just checked and I cannot find it in the service manual either. ?? Without some type of indication as to where to look, I think anything anyone comes up with is a pure guess.
Your idea of removing the PC V is good though and a great place to start.
Otherwise it might be worth a call directly to Kawasaki because that is all I think a dealer will do with this case.
Brian
I just started to get the f1 error code flashing once in awhile on my 08 yesterday during a short highway run, the bike continued to run fine and I made it home ok. Today I went to start the bike and I am getting an error code 39, I can't even find that one in the manual. I checked the battery and the grounding and that is fine, I am going to try disconnecting the PCV and see what happens. The bike is out of warranty.