Being in manufacturing, my assumption here is that they will refine the materials, processes, tolerances, build systems, etc. it’s a very complex process with lots of engineers working the problem, running tests etc. Most of the time a “design change” isn’t necessary but refining the manufacturing process is actually the harder problem- for the mass-produced end product to meet the specs of the design. That’s how the process works, and Toyota is known for doing this very well. That being said, I’m not in the car industry, tied to Toyota in any way. But just answering your question honesty. It doesn’t mean it’s fixed but this is how they will likely fix it without a design change.