As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 2 ENGINE AT FL410, EGT SURGED TO 810 DEGREE. RAN SURGE QRC/QRH AND HAD TO RUN NR 2 AT IDLE TO MAINTAIN EGT 500 DEGREE. DID NOT SHUT DOWN NR 2. USED ENGINE NORMALLY AT 10,000 MSL. NO VIBRATION NO N1/N2 OR OIL ISSUES. JUST ERRATIC EGT UNTIL LOWER ALTITUDE. NR 2 THRUST REVERSER NOT USED. R & R THE NR 2 ENGINE J10 HARNESS IAW AMM.