For a broken torsion spring, we match the spring to the door's weight and drum size rather than grabbing whatever's closest - on a house built the year Dunn Loring's typical home went up, that's often a heavier-gauge spring than what a lighter modern door needs. We replace both springs on a double-spring setup even if only one failed, because the other one is the same age and close behind it.
For cable or roller wear, we check the track alignment first - in a cold climate, contracted metal can throw brackets out of true just enough to bind a door that otherwise looks fine. We true up the track before we call the job done, not after a callback.
One limit worth saying plainly: if a door's opener and springs are both original from a 1970s build and both are failing at once, sometimes the honest call is replacement over repair, since patching two aging systems separately can cost more than one clean swap. We'll tell you which side of that line your door sits on.