The median home in Cerritos went up around 1974, later than a lot of the older tract housing scattered through this part of the county. That means most garage doors here were built for openers designed around that era's standard torsion or extension spring setup, not the lighter modern doors some manufacturers make today. When a homeowner swaps in a newer, lighter opener without checking the door's balance, the opener motor takes on load it wasn't built for, and gears strip early. We also see a fair number of these 1974-era openers still running original drive assemblies that have simply outlived their gear life - plastic gears from that period weren't made to run forty-plus years, and most haven't been serviced since installation. The mild coastal-influenced climate here (per regional climate data) means we're not chasing frozen lubricant or ice-locked tracks like colder-climate techs do; the failures we see are mechanical wear and worn photo-eye alignment, not weather damage.