From a 19 May incident on a 787 which had just re-entered service
One of the nuts that connects wires and the board had come loose and an area around it of about 4 square centimeters had turned black....
and now
Japan Airlines halts 787 flight after battery pressure sensor problem
TOKYO, June 3 (Reuters) - Japan Airlines Co said it halted a scheduled 787 Dreamliner flight on Sunday after engineers detected a faulty pressure sensor in one of its newly reinforced lithium-ion batteries ......
The fault which affected the Tokyo-Beijing flight on Sunday was caused by tape that had been mistakenly left over the pressure sensor when Boeing engineers installed the new batteries, Japan Airlines said in a press release.
What chance a quality installation of the fix ? I thought ETOPS certification was based on bullet-proof maintenance procedures. Not like these ones by the "fix team".