I had this same error and had to send it into Nintendo. I think all the pieces (you'd need to fix, i.e. timing for lens) are the same so NOA might still be able to help you. Modding the cube just voids your warranty and since you imported I'm guessing it would have been void anyway (lasts only a year). Call Nintendo. They will likely say that it is because you modded it, but tell them your cube is showing symptoms of the Disc Read Problem that is talked about even by owners of North American gamecubes.