The most common call is an opener that runs the motor but the door doesn't move, or moves a few inches and reverses. On the older stock from the 1938-2004 build range, that's usually a gear set worn down from years of lifting a door that's heavier than the opener was ever rated for, or a drive mechanism that's just outlived its parts.
You'll also see openers that work fine in summer and start grinding, stalling, or throwing error codes once the cold sets in. That's not coincidence. In a cold-and-severe climate band like this one, grease inside an older gearbox stiffens up, chains lose a little tension as metal contracts, and a motor that was already working hard now has to push through resistance it didn't have in July.
A third pattern: openers that have no battery backup and no way to disengage the carriage by hand, which matters a lot when the power's out in January and the car's trapped inside. If your opener is from the era before backup batteries were standard, that's worth flagging even if nothing's broken yet.