The climate here runs cold-moderate, which over several decades of freeze-thaw cycles does slow, steady damage to anything metal that flexes - springs, hinges, roller shafts. On a door from the 1976 era that's had forty-plus years of that cycling, metal fatigue shows up as a spring that finally lets go, often on a cold morning when the steel is stiffest and under the most load.
Across the broader area the housing stock runs 1958 to 2003, with most of it concentrated in the 1980s and 90s, built in roughly thirteen named pockets. Alcoa's own stock sits toward the older end of that range, which means original hardware is more common here than in the newer subdivisions nearby - original torsion setups, original track gauges, sometimes original openers that have simply outlasted their intended service life through dumb luck and light use.
That combination - older average build year plus decades of cold-moderate cycling - is why we see more spring failures and worn roller assemblies on Alcoa calls than opener-only electrical faults.