On a maintenance visit we work the same sequence every time: check the springs for wear and tension, run the door through a full cycle to watch the track and rollers, check cable condition at the drums, test the opener's force and auto-reverse settings, and lubricate the moving hardware. On a house built around 1978, we pay particular attention to the torsion spring's cycle history and to track brackets, since those are the two points that show their age first in a cold climate.
If everything checks out, that's the whole visit. If a part is close to failing, we'll tell you what we found, what it means for the door through the coming winter, and let you decide whether to fix it now or wait. We're not going to replace parts that still have life left in them just because the door is old.