I wonder if any of these issues could have something to do with the aircraft being in long term storage before delivery? Weren't the first 30 or so frames completed and stored in Seattle pending certification? Could such storage perhaps have had some adverse effects on the failing components?
LOT Polish Airlines' 788s were delivered immediately after assembly and factory test flights. The first one failed around 2nd day after that, and more often sits on the tarmac then flies. The second one also has its problems, so many 788s flights cancelled are changed to a good old 734.
No emergencies of course as yet.