I'm not sure we know this for sure - only Toyota would confidently this information.One thing is not clear to me but maybe someone here can help clear up. Were all engines built after 04/10/24 built with both the new cleaning process and the more robust bearing? Could there still be engines, such as mine build 04/18/24 built with the new cleaning process but not the new bearing? I read somewhere that the new bearings were not in the build process until 05/2024
Toyota (in typical Kaizen fashion) is still continuously tweaking their production processes and "monitoring the outcomes", meaning we and Toyota won't know exactly what production date fixed the issue until we see warranty rates a few years from now.