Lubricating hinges, rollers, and the track, and tightening loose hardware on the bracket, is reasonable weekend work on a door of this era and doesn't require touching anything under tension. Clearing the photo-eye sensors and recalibrating the opener's travel limits is also within reach if you're comfortable reading a manual. Torsion springs are not a do-it-yourself repair. A spring wound to hold a double-car door has enough stored force to break a hand or worse if the winding bars slip, and we don't say that to sell you a service call, we say it because it's true regardless of who does the work. If your door is dropping fast, won't stay up, or the cable has come off the drum, that's a call-in job, not a tutorial.