As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, LEAVING MAX RPM, RT ENGINE BEGAN SURGING. THE FLIGHT CREW DECLARED AN EMERGENCY AND RETURNED TO GSP UNEVENTFULLY. CLEANED CANNON PLUG CONNECTIONS ON RT ENGINE ECU. PERFORMED ENGINE RUN. UNABLE TO REPLICATE ENGINE SURGING. NO FURTHER DEFECTS NOTED.