As we all know it was the same crack in a second stage planet gear on G-REDL on 01.04.2009 and LN-OJF on 29.04.2016, which caused the MR to separate. After all the measures taken, like reduction of the MGB TBO to roughly one third of the initial TBO, installation of another mag plug, flight ban on one type of planet gear etc etc, the 225 could be considered as safe for flight (again), imho. Especially the more frequent scheduled MGB removals drive the costs per flight hours, but who cares.
However, after thousands of engineer hours and millions of Euros for the regarding technical investigation, the reason why a crack (twice) could propagate inside the gear rim, undetected by e. g. HUMS and the classical methods like mag plug and filter, remains still unknown. Strange, isn't it?