The drive from our Whittier shop to Hacienda Heights is three miles, which is short enough that a tech can look at the job, call the shop for a part if the truck doesn't carry it, and still get it closed the same day. That matters here because the hardware isn't uniform. Hacienda Heights homes run a median build year of about 1968, a touch newer than the broader service area's 1964 median, but still well inside the 1960s-70s stock that makes up most of these 86 named communities. A door from that era was usually sized for a single torsion spring and a lighter steel section than what gets installed today. When a homeowner swaps in a heavier insulated door decades later without upgrading the spring, the opener starts straining on every cycle, the drive gear wears early, and the door looks fine right up until the spring lets go. That's the failure we see most: original-era opener hardware fighting a door it was never sized to lift. It's a three-mile fix, not a hard one, but it starts with knowing what's actually hanging on the track before anyone touches a wrench.