During the big brouhaha on the unintended acceleration "problem", there was a report that Toyota had found defective accelerator components from a US sourced supplier while the same component from a Japan source did not have the problem. I'm trying to find a link to that report or to it's source.
A Popular Mechanics article on that subject: Toyota Tackles Sudden Acceleration With New Recall - Popular Mechanics CTS response to Toyota's allegations: CTS News Release