A buddy who works 777 tells me the event engine was a GE90-115B, not a Trent.
Rather amazingly, he says that based on the borescope, there is minimal damage to the core (fan and nacelle were pretty trashed though) .
However it sounds like they're going to do a completely overhaul regardless...
If your pal has been examining a GE90, it would be amazing if he found any damage at all, given that the aircraft in question was a Trent-powered 777-200ER (9V-SRP, msn 33369).