the cold-moderate climate band this area sits in means grease drying out and metal contracting every winter, the same freeze-thaw cycle that snaps original lift cables on doors this age. A spring built in 1978 wasn't engineered with a service life of fifty winters in mind - most torsion springs are rated for a fixed number of cycles, not years, and houses from this build era have long since burned through that rating even with light use.
Household income here runs near $129,171, well above the $74,943 median across the wider coverage area, which is why we see more owners paying to upgrade worn 1970s openers to quieter belt-drive units rather than patch them. That's not a sales pitch, it's just what the maintenance calls here tend to turn into once the opener's age comes up.
The other failure point specific to this stock is track alignment. Original tracks on these doors were hung on wood framing that's moved slightly over four and a half decades, so a tune-up here often means re-squaring hardware that was never touched after install, not just lubricating it.