I had the petrol ****ing all over the tank problem. I just whipped the cap off and re-seated the rubber seal between cap and tank.
I know things should work fine first time but sometimes I fix the little quirks myself rather than having to wait for the dealer, then get them to check it out when it next goes in.
Currently my 749 has a little coolant leakage problem.
the joys of owning a duke.