Rochester sits in a cold-severe climate band, and Henrietta shares that exposure. Steel cable doesn't love repeated freeze-thaw cycling on an unheated garage, especially where the original 1970s-era pulley or drum has picked up rust over four-plus decades. On a door built around 1978 that's never had the cable replaced, the strand you're looking at has been through roughly fifty winters of that cycling. The other common cause we see is a cable that's simply worn through at the drum groove from age, not from any one dramatic event - no ice storm story needed, just decades of use on original hardware. Track misalignment from age also puts uneven load on one cable versus the other, which is why one side often lets go first while the other looks fine for a while longer. None of that is unique to a single street - it's the age of the hardware across this part of town, not a one-off accident.