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