YYZ has more Maintenance capabilities at the current time. At the time of the occurance, MOC & Dispatch would be aware that we would probably need to boroscope the engine, and depending on the findings, possibly replace that engine. We're all set up for this type of work in Toronto.
Of course, if it had been a more severe type of occurance, the flight would have diverted to the closest appropriate airport. After all, we've done engine changes in Alaska, out on the ramp.
The curious thing to me about this flight is the equipment. I've not been aware of the 777 being used on this route ( as in this case), it's always been a 767. Maybe it's a case of higher loads during the holiday period.