What was found
JUST PRIOR TO LEVEL OFF AT FL 340 NR 2 ENG BEGAN TO SURGE BETWEEN 80 PERCENT AND RED LINE ON N1 GAGES N1 INDICATION RED BOXED MOMENTARILY TWICE EGT N2 FUEL FLOW WERE SURGING AS WELL. E 1.5 CHECKLIST FOLLOWED AT POWER REDUCTION EVERYTHING SMOOTHED OUT AND ENG RAN AS PER NORMAL WITH ALL GOOD INDICATIONS NOTES IN CLEAR SMOOTH SKYS ENG A/I OFF CENTER FUEL EMPTIED AND PUMPS OFF JUST PRIOR TO SURGING NO EXCESSIVE VIBRATION NOTED. REMOVED AND REPLACED NR 2 ENGINE. VERIFICATION FLIGHT SUCCESSFUL. OPS NORMAL.