If it has sentimental value to you and you want to get it fixed you will need to find a good framebuilder that can fix it and hopefully paint it for you also. Just realize that you will have to take all the components off. Then the framebuilder will have to replace the tube and repaint the new tube and the effected part of the frame. Getting the color to match perfectly is a challenge since the paint on your bike has seen 30 years of "weathering"/use. Plus you will need to source some decals that will need to be applied. Afterwards you will have to re-assemble all the components on the bike and make the proper adjustments. At that time it might be good to replace the cables and housing that are probably worn. Can it be done, yes! Will it cost you more than the bike's value, yes! Is it worth it? Only you can decide the answer to that question.
