SoS
Given the almost faultless history of this device, installation/location of this device may be where the AAIB should be concentrating their efforts.
I have been having the same thoughts, as I 'believe' that ET do not have the rear crew rest areas installed on the 787 at the rear, so straight away there would be differences from standard production types.
I am presuming that all of the original services that would have fed into this rest area would still be roughly in that location, albeit disconnected and (hopefully) all safely capped off and secured. The internal finishes and fittings would therefore also be nonstandard in this area. So could this combination cause some kind of detrimental enviromental change in the area where the ELT is located?
Given the number of ELT's in use its either the ulimate s*ds law that this has happened on a 787, or is there something specific about this ET version?
Is it known if there are any other operators using this configuration?