As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLIMBING THRU 15,000 FT, THE NR 2 ENGINE SURGED FROM 87 TO 84 PERCENT TORQUE FOR A MOMENT. EVENT MARKER WAS PUSHED SHORTLY AFTER. RETURNED TO FIELD. LANDING UNEVENTFUL. REMOVED FROM SERVICE. REMOVED AND REPLACED NACELLE SHUTOFF VALVE IAW AMM 36-11-19-000-801, & 36-11-19-400-801. VALVE OPS CHECKED GOOD ON GROUND ENGINE RUN. NO TORQUE OSCILLATIONS NOTED. AIRCRAFT RETURNED TO SERVICE.