The most common surprise on 1968-era doors here is a mismatch between the door panel and the track it's riding on. Somewhere along the way a previous owner swapped in a lighter replacement panel without updating the spring tension, and the door either slams down or won't stay open. On aluminum panels from that era, we also see denting at the bottom corners where decades of settling have pushed the frame slightly out of square, which binds the rollers. With 5,290 households in Lake Forest Park, a small slice of the roughly 103,888 owner-occupied houses across the whole service area, this isn't a huge sample, but the pattern repeats enough that it's worth checking the track alignment before assuming the spring is the only problem. We won't replace a spring and call it done if the track is the real issue.