Lomopaseo and Gaspath,
have a look at this picture:
DSCF0020 | Flickr - Photo Sharing!
You will see a green and white wire. This is the EGT thermocouple harness, the EGT probes are located at the IP turbine station on the RB211. You will also note the turbine casing has opened like a sardine tin lid. Turbine stator vane or blade material is never going to have enough energy to do that.
As for shipping the engine to HKG, RR have an engine facility here, HAESL, which in a sense is more easy for them to do the work. Because CX aren't doing any major work on their RB211's at the moment, the shop is 'twiddling it's thumb's'. Also geographically closer to Oz than Derby.
Plus a little californian bird tells me that it was indeed the IP turbine that let go. But after all this is only a rumour.
Best Regards,
N1 Vibes