On a door this age, the failure points are predictable once you've seen a few dozen of them. Torsion springs that were sized for a lighter, single-layer wood door now hold up a heavier steel or insulated replacement, so they wear out faster than the spec sheet says they should. Rollers on the original track are usually the steel kind with no nylon jacket, which means noise and eventual binding as the track wears unevenly. If the opener is original, the drive gear inside is plastic and it strips - that's an honest limitation of the design, not a defect, and once it strips there's no fixing it, only replacing the unit. We'll tell you straight when a repair isn't worth it against a full swap, especially on hardware this old.