Keller's housing stock centers on 1999, which puts most garage doors here at the point where factory foam-core panels start to let go. These weren't the thin single-skin doors of the 1970s. By the late 90s, builders were putting in insulated steel doors with a foam core bonded between two steel skins, and that bond is the weak point. Twenty-five-plus years of Texas heat cycling - the panel baking in direct sun, then cooling at night - works at the adhesive until the skins separate. You'll see it as a bubble or a soft spot on the sun-facing side of the door, usually the top two panels first.
Across the wider service area the housing spans 1953 to 2014, but Keller sits later in that range, which matters for parts. A door built here in 1999 almost certainly takes a panel section that's still a common size, not the oddball short panels you'd find on a house from the 1950s. That's good news when it comes to sourcing a replacement panel instead of a full door.
We travel to Keller from North Richland Hills, about 5 miles out, so we're not guessing at this housing stock from a distance - it's the same build era as a lot of what we already work on close to home.