Just purchased. Interior for the most part had been restored, now the headliner is sagging. Is thereaAny way to fix with removing?

There are 3 or 4 bows that hold the headliner up. They pass thru pockets sewn into the headliner at the seams. Is that where its sagging? Bow may have popped out of its hole or the headliner may have torn at the seam. Depending on where it is sagging, you may be able to fix it without removal. Good Luck.