There's real stuff a homeowner can do between visits: wipe down and lightly oil the rollers and hinges with a garage-door-specific lubricant (not WD-40, which washes out grease rather than adding it), check that the auto-reverse still trips on a rolled-up towel under the door, and look at the cables for fraying near the bottom bracket. Vacuum the tracks so grit doesn't grind into the rollers.
What we'd tell you to leave alone: the torsion spring itself. It's under enough stored tension to break a bone or worse if it lets go while you're working on it, and on a door this old the spring is usually original and tired, not just dirty. If you're hearing a loud bang from the garage or the door won't budge, that's a call, not a weekend project.