I don't think there's anyone in Norway who can fix that but check with Interfoto
if they know of anyone. If not, you have to send the lens somewhere to have it fixed; there are plenty of repair shops in Europe and the US.
(Your biggest problem will probably be to avoid be hassled by the Norwegian Customs when the package returns. There are forms to fill out to make it in a legal way but it's one real PITA. Ask ErikFive, I think he tried it once...)