What is the cause of cracking and corrosion in Trent 1000 engines? According to this description and this one of some Trent 1000 engine problems, there appears to be a problem with cracking/corrosion of the fan blades, but does anyone have any insight as to why this is the case? (And why this problem doesn't occur on other platforms?)

I was thinking it could be due to the composites used in the compressor fan blades, or perhaps something to do with the no bleed-air system unique to the Trent 1000, but I'm not entirely sure.
The problem is sulfidation corrosion, according to this article:
https://airinsight.com/rolls-royce-trent-1000-corrosion-issues/

Turbine blades are made of metal, and they suffer temperatures and forces so high that they are usually 'grown' from a single metal christal. A single blade can cost as much as a luxury car. 

The problems also seem to be related. Corrosion leaves a little pit, which turns in to a crack due to the cyclic loads.