I noticed that the headliner in my '95 XLT is starting to sag. It is an area about the size of a bread plate just above the driver's head. The fabric itself is spotless and it appears that the adhesive that holds it to the backing is just giving up. Is there some way to fix this? I'd hate to trash a perfectly good looking headliner if I don't have to. BTW, if this can't be repaired where can I find a replacement piece?