On an extension-spring door, a failing cable usually shows up as one corner of the door sagging lower than the other, or the door refusing to sit flush at the bottom. You'll often hear a scraping or ticking sound from the pulley as it turns on a worn cable. On torsion systems, which are more common in the newer pockets of the service area, a frayed cable tends to show up as a door that jerks or stutters partway up, because the drum is pulling unevenly.
Either way, Lake Lorraine's mild climate with occasional freeze keeps outright ice damage off the list, but humidity still does its slow work on galvanized cable coating over decades - it's corrosion more than cold that finishes these off.