When looking for Sun Tunnel installation and repairs, VSky, The Adelaide Skylight Guy, is your guy. You need to get light into that dark room in your house and a Sun Tunnel installation will give you all the light you need.
Here are some of the shots from the Velux Sun Tunnel installation we did recently https://goo.gl/photos/531xHQ5cLTc9ftFk7. You will notice that we had to uninstall the old skylight in a tile roof house. The new waterproof and stylish looking Velux Sun Tunnel turned out a treat.