As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) SEPT 11/09 C-GHPW NR 1 RPM DROPPED 1% TO 99% IN CRUISE, FURTHER DROPPED TO 96%. PITCHLOCK CHECK CARRIED OUT OKAY. RPM CONTINUED TO SLOWLY DROP. AT 95% THE ENGINE WAS SHUTDOWN. THE NR 1 VALVE HOUSING WAS REPLACED AND GROUND RUNS CARRIED OUT. (TC# 20090914001)