I'm with Chuck on the PT6 issue. Excellent engines, but not perfect, neither is P&W. My total flying of PT6's (-27, and -28) is about 120 hours. During that time, I personally shut one down preventatively, when the fuel control unit failed within 10 hours after a P&W repair/overhaul (I don't know which). This maintenance had been required because the same engine had been overtemped because the previous FCU had failed weeks earlier. Pilot action/inaction had not at all been a factor in the failure in either case.
Not statistics, just my experience.