Lubricating hinges, tightening loose bolts on the track brackets, and testing the auto-reverse safety feature are all reasonable for an owner to do without a torsion spring in the picture. The spring itself is not a DIY repair - it's wound under enough tension to break a wrist or worse, and that's true whether the spring is three years old or has been quietly holding since 1980. If your door came down hard, won't stay up on its own, or the cable looks frayed, that's a call-a-pro situation, not a weekend project. We'll say plainly: a door that's cycling fine but just looks dated usually isn't worth replacing outright, only repairing - full replacement makes more sense once the track, hardware, and panel are all failing at once, not one at a time.