As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: DURING CLIMB, ENGINE 2 N1 INDICATION WAS ERRATIC. IT WAS INDICATING +/- 5%. ENGINE FADEC APPEARED TO BE VARYING THRUST TO COMPENSATE. THE ANOMALY HAPPENED FOR 2-3 MINUTES AND SELF CORRECTED FOR THE REST OF THE FLIGHT. MAINTENANCE ACCOMPLISHED TSM 77-00-00-810-852-A AND REPLACED ENGINE #2 J10 HARNESS IAW AMM 73-21-50.