Some history on the engine:
G-VIIO is fitted with the GE90-85B, although a GE90, it is a up-rated GE90-76B which is the original and baseline GE90.
Here the FAA's Type Certificate Data Sheet for the GE90
http://rgl.faa.gov/Regulatory_and_Gu...9EN_Rev_18.pdf
GE90-85B Same as GE90-76B except higher thrust ratings. Corresponding
Rating Plug changes
The more recent -90/92/94B and -110/115B are significantly different and incorporate a lot of lessons learned from the original service entry issues faced with the -76/77