As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN CLIMB RIGHT ENGINE HAD SPIKE IN ITT AND REDUCTION IN N1 AND N2 AND WAS UNRESPONSIVE FOR 10-20 SECONDS. THEN RETURNED TO NORMAL. ON APPROACH RIGHT ENGINE AGAIN HAD SAME INDICATION AND AIRCRAFT HAD VIBRATIONS. DURING BOTH EVENTS THRUST WAS BEING REDUCED BY PILOTS. AIRCRAFT REMOVED FROM SERVICE. R&R RH ENGINE REF W/O 342015 FOR WORK PERFORMED REFERENCES, CHECKS AND RII'S.