Can you elaborate on the repairs with photos? Many of us may be able to offer you some alternative solutions to taking it all apart. Sometimes a simple whip stitch and additional quilting will fix seams coming apart.
The only reason I can think of to take a quilt entirely apart to repair is due to the batting migrating and bunching and having to replace it. Or fabric being of low quality and falling apart so you have to replace pieces of the patchwork and even then I have repaired that that with applique. Other than that it is amazing what a little hand work and additional quilting can fix.
Like Maniac said, I think it would be easier to remake the quilt than repair it. You probably won't be able to replicate the fabrics but you could come close with tone and color.