Does the 1000 have the same architecture as the 900 re: gearbox? After the lengthy thread about the Qantas uncontainment, another "manufacturing defect"? I doubt the 56M charge off was the only one, won't they be a quarterly deal?
The drive shaft for the gearbox takes its power off the High Pressure shaft, just forward of the Turbine. It seems like an awful lot of rpm for a power take off.
How does the corrosion happen, is it present prior to assembly? That makes it a QA problem. What in the transmission could cause corrosion?