Front End Problem?!!!!!!

[TG]

I can feel slight tapping in the steering wheel when I make a gentle turn at about 30 MPH, is this a normal thing with the H2?
Not long ago I got a warning from the driver information system "service 4wd" and my dealership picked it up and repaired whatever was wrong with the 4wd, I mentioned about the tapping and they said they would look at it (it still taps). I would take it back, but it's a 2 hour drive for me. Has anyone had this "tapping" experience with their H2, and if so were you able to find out the source and a cure for it?
Thanks,
Tim