so in your mind, what happens when a recall occurs and some defective part is replaced with another part? do you think they run these replacements through all your supply chain management testing setups all that huh?

or they don't replace the defects?

?

no, this happens all the time. it allows manufacturers to respond to systems that didn't age well, or didn't stand up to public users, or children, or was unsafe in a way that didn't present itself during testing. these things happen. manufacturers make adjustments, replace parts, change software, and put it back out on the road.