As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT CREW RETURNED TO THE FIELD AFTER THE RIGHT ENGINE TORQUE STARTED TO FLUX AFTER TAKEOFF AND HAD A COMPRESSOR STALL. MAINTENANCE INSPECTED THE AIRCRAFT, PERFORMED ENGINE GROUND RUNS AND COULD NOT DUPLICATE THE PROBLEM. THE AIRCRAFT WAS RETURNED TO SERVICE.