Most garages in Hacienda Heights went up around 1968, and the doors that came with those houses are usually single steel panels on a basic chain-drive opener bolted to a header that was never built for anything heavier. That opener has likely been swapped once already, sometime in the 80s or 90s, but the mounting hardware and the travel limits often stayed original. When these units fail now, it's rarely the motor itself - it's the gear that drives the chain, worn down after decades of lifting a door that's heavier than the opener was ever rated for. We also see a lot of failed safety sensors on these setups, because the photo-eye brackets on older installs sit low and get knocked out of alignment by anything leaning near the track. With 16,498 households in this pocket of the service area and a lot of them sharing that same 1968 build year, the opener problems repeat themselves house to house, which is useful - we've seen the pattern enough times to know where to look first.