As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLIMBING THROUGH APPROXIMATELY FL 260 PILOTS NOTICED NR 2 ENGINE SURGING IN N1 ACCOMPANIED BY YAW. ENGINE LIMIT/SURGE/STALL CHECKLIST COMPLETED. AS NR 2 THRUST LEVER WAS REDUCED ENGINE CONTINUED TO SURGE TO A LESSER EXTENT UNTIL 1/4 OF THE WAY TOWARDS IDLE WHEN ENGINE BEGAN TO RESPOND NORMALLY TO THROTTLE MOVEMENT. CENTER FUEL PUMPS WERE SWITCHED OFF APPROX 2 5 MINUTES BEFORE SURGE BEGAN. N1 LIMITS EXCEEDED ON ENGINE NR 2. DIVERSION TIME 0H:28M. REPLACED NR 2 ENGINE REF WO# 145932.