A 1975-era door in a cold-climate town like this has a predictable failure pattern. Torsion springs rated for the original door weight lose tension after years of temperature swings, and a door that used to lift with one hand starts needing two. Rollers on the original tracks wear oval instead of round, which you can hear as a grinding rattle before the door ever gets stuck.
Openers from that build era, if never replaced, are usually chain-drive units with no battery backup - a real problem in a cold-moderate climate zone where a power outage and a frozen driveway can show up on the same night. We also see a lot of warped bottom panels on doors that face prevailing weather head-on, since steel from that period wasn't insulated against the freeze-thaw cycle this climate band puts it through every winter.
We don't troubleshoot electrical wiring upstream of the opener - that's an electrician's job, not ours, and we'll say so if that's what's actually wrong.