The problem with the original rotor brake actuator is that after exposure to heat after so many hours the micro switches in the actuator would malfunction, apparently a upgraded version is in the works and should be available soon, Noobys rotor brake issue with a pressure sw fail is the only one I have heard of.
The Hydraulic Module No2 bypass button popping (most forward one) is still a on going issue on the AW139, I specifically asked about this issue while in Vergiate last week and have yet to get a satisfactory answer. Don't bother changing modules as that will not fix the problem. At one time Agusta said it was the landing gear cycling that caused the button to pop but that is untrue, we flew our machine around with the gear down one day and the button still popped. Temperature is a factor, in the warm summer days the button pops almost immediately, on cold days on short trips it does not pop. There has been some talk that perhaps the filters are too tight and need the micro spec opened up.
Has anyone else heard otherwise?