As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT ENGINE N1 VARIES INFLIGHT DURING CRUISE. N1 CONTINUALLY OSCILLATES .5 PERCENT AT CONSTANT THROTTLE SETTING. RIGHT ENGINE EPR CHANGES IN RELATION TO N1 CHANGES. REMOVED NR 2 ENGINE FMU REF AMM 73-21-01. INSTALLED SERVICEABLE FMU ON NR 2 ENGINE IAW AMM 73-21-01, OPS & LEAK CHECK GOOD ON HIGH POWER RUN UP.