A full roller set replacement is ten rollers - both tracks, top to bottom - plus a check of the brackets they ride in. On a door this age we expect at least one bent bottom bracket from years of steel-on-steel wear, and we replace it rather than straighten it, because a straightened bracket under load fails again within a year or two.
We also check the track alignment while the rollers are out, since a track that's been riding bad rollers for a decade usually needs a tweak, not a full replacement. Nylon rollers with sealed bearings go back in instead of steel or open-bushing rollers - quieter, and they don't flatten the way the originals did. We don't replace springs or cables as part of a roller job unless they're visibly worn; that's a separate call and a separate price, and we'll tell you straight if we see it.