As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE CLIMBING THROUGH 13000 FT, THE NR 2 ENGINE SURGED ONCE WITH A 3 TO 5 PERCENT TORQUE FLUCTUATION AND A NOTICEABLE YAW AND SOUND CHANGE. REMOVED FROM SERVICE. ACCOMP T/C 73000Q01. NO FAULT CODES POSTED. ACCOMPLISHED A GVI ON THE NR 2 ENGINE. NO OBVIOUS DEFECTS. R & R THE NR 2 FADEC IAW 73-21-01-000/400-801. OPS TESTE GOOD IAW 71-00-00-868-805 APPLIED SECTIONS. NO FAULT CODES REPOSTED. AIRCRAFT RETURNED TO SERVICE.