Most houses standing in Castro Valley today went up around 1966, and that number matters more than it sounds like it should. A door installed on a house built in the mid-60s almost always started life as a single steel or wood panel slab on extension springs, not the sectional torsion setup you'd find on anything built after 1990. Even where an owner has swapped the door itself, the track, the header bracket, and the opener mount often date back to whatever went in the first time. We drive out from Fremont, about 16 miles, and the jobs we see out here skew toward that older hardware far more than newer subdivisions do. A maintenance visit on a door like that isn't the same checklist as a maintenance visit on a 2005 sectional door, and treating it like one is how small problems get missed. We look at what's actually on the house, not what the manual says should be there.