As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AIRCRAFT DEPARTED FOR DESTINATION, WHEN THE CREW ATTEMPTED TO SET CLIMB POWER, THE RT PROP DROPPED TO 1200 RPM AND THE TORQUE WENT TO 2200 LBS. THE CREW DECLARED AN EMERGENCY AND LANDED UNEVENTLY . MAINTENANCE WENT TO SITE THE FOLLOWING DAY AND CHANGED THE RT PROPELLER, RIGGED IT AND PERFORMED GROUND RUNS .THE AIRCRAFT WAS RETURNED TO SERVICE WITH NO FURTHER PROBLEMS. (TC NR 20070322005)