Kennewick sits in a cold-moderate climate band, and that daily swing - cold mornings followed by direct afternoon sun on a south- or west-facing door - is hard on steel panels that have been expanding and contracting through the same cycle for twenty or thirty years. That stress tends to settle into the seams first, which is why seam cracking is the complaint we hear most, rather than a single dramatic failure.
It also matters that so much of the housing across the service area, spread over six main pockets, was built within the same roughly twenty-year window from 1981 to 2000. That means the original panel doors going up now are all aging out close together, on similar hardware, which is part of why panel sourcing for this specific era comes up so often. With close to 19,085 owner-occupied houses in the area and a median household income a bit over $87,000, a lot of owners here are making the same call we described above - fix the one bad panel instead of replacing a door that's otherwise sound.