As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) PILOT REPORTED DROOP IN RPM AT TAKEOFF. FLEW TO BASE WITH NO PROBLEM. CHANGED OUT GOVERNOR. COULD NOT RIG CONTROLS AS PER MAINTENANCE MANUAL. INVESTIGATION RESULTED IN FINDING INOPERATIVE DROOP COMPENSATOR DUE TO SHEARED RIVET. RIVET REPLACED, CONTROLS RIGGED. OPS NORMAL.