HeadingSouth
What worries me most is the fact that the Japanese Investigation Team found "this" fault of a wrongly connected part.
It's improbable that this particular miswiring lead to the battery failures experienced. What it does do is to extend the scope of the investigation beyond the components and subsystems. Where there's one manufacturing or configuration control error, there may be more. And with this evidence, investigators can take a closer look at QA processes that may have contributed to the subject failure.
What exactly were the Boeing engineers doing the last few weeks ?
Good question. Perhaps armed with this finding, the FAA and JTSB can now go in and find out.