Pretty good confirmation that they did correctly diagnose the Heathrow fire.
http://www.reuters.com/article/2013/07/26/us-ana-dreamliner-beacon-idUSBRE96P0AK20130726
“Japan’s ANA finds damaged battery wires on Boeing Dreamliner locator beacons”
FAA AD:
It looks like these ELTs were sitting on the shelf for a long while before being installed into the 787s, due to the delays in getting the 787 into revenue service.
So, to have the proper 10 year battery life with the install, the battery packs were replaced with new ones when the ELTs were actually installed in the planes. This is when the wires were pinched, apparently.
This is probably why they can limit the inspections to 787s for now.