How can i fix the lens on my Nikon camera?

I have a Nikon D80 camera with a AF-S Nikkor 18-70mm lens and the lens is not working properly. To zoom in and out you twist it forward and back but mine is locked and wont go past 24mm and then if i get it further if wont come back to normal position without alot of careful small time consuming movements and even then its no gaurentee. \r\nDo you think this is a repairable fault?