As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MSP - FLT 3327- IN CRUISE FLIGHT, THE ENGINE RPM DID NOT RESPOND TO POWER LEVER MOVEMENT. THE AIRCRAFT RETURNED TO MSP AND LANDED WITHOUT INCIDENT. MAINTENANCE CLEANED THE PROP GOVERNOR LINKAGE. THE PROBLEM COULD NOT BE DUPLICATED DURING GROUND RUNS. SYSTEM OPERATED SATISFACTORILY DURING A TEST FLIGHT. (X)