.Let's not forget, amongst all the wild theories of "other scrap B777 components" being the source of the flaperon - that a total of 1320 B777's (all variants) have been built to July 2015, and only 5 hull losses have been incurred by this model.
At least 3 ADs about attachement issues were released.483 B777 are affected by this one only:
http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgAD.nsf/0/eb53c736eb04bcb4862570d900590daf/$FILE/2005-25-24.pdf
A worn attachement might lead to damage due to vibration or overload of a flaperon.