Chino Hills is a different build era than most of the territory we cover. Houses here cluster around 1990, a good two decades newer than the 1968 median you find across the broader service area, where stock runs from 1938 to 2007. That gap matters more than it sounds like it should. A garage built in 1990 almost certainly shipped with a chain-driven opener and a steel sectional door on torsion hardware that was already standard by then - not the older extension-spring, side-mount setups we deal with in the area's oldest pockets. The fault we see in Chino Hills isn't a mismatched bracket from a 1960s stud pattern. It's a 30-plus-year-old opener motor, the original one, still bolted to the same ceiling joist, running on a gear set that was never built to last three decades. Capacitors dry out. Logic boards from that era don't have rolling code security or battery backup. The door itself is usually fine. The opener is the part that's aged out, and it aged out on a predictable schedule because the house itself is a known quantity. That's the five miles of difference between a Chino Hills job and one in an older part of the territory - same company, same truck, different failure.