Most garage doors in University Park went up around 1987, give or take a few years either side. That era is when builders here moved away from single-layer wood panel doors toward heavier steel sandwich doors with foam fill between the skins - still common on the two-car garages typical of this neighborhood. The extra weight on those doors asks more of the lift cables than the lighter doors from decades before, and the cable drums and galvanized strand on a door that age are now pushing past their expected service life.\n\nWhen a cable starts going, you'll usually see one corner of the door hanging lower than the other, a door that looks crooked in the frame when it's halfway up, or a loud bang followed by the door refusing to move at all. Sometimes it's just visible fraying near the bottom bracket - thin broken strands poking out of the cable like a frayed shoelace. On a door this size and weight, a snapped cable under tension can whip hard enough to dent the track or the panel next to it, so if you see fraying, don't keep running the opener hoping it holds.