Most Lucas houses were built close to 2002, which puts the original torsion spring, the original steel roller track, and often the original chain-drive opener all the same age and all approaching the end of their rated life at roughly the same time. That's different from a neighborhood built in the 1980s, where the opener has usually already been swapped once and the spring with it.
What we bring depends on what's failed. A snapped torsion spring is a straight swap for a matched pair, sized to the door's weight - we don't run one side original and one side new, since that puts uneven load on the shaft. A dead opener from that era, if it still has the older non-rolling-code receiver, usually gets replaced rather than patched; parts for boards that old aren't something we stock. Cables, rollers, and hinges are simpler and get swapped on the spot in most cases.