As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT CRUISE FL 200, FLUCTUATION IN NR 1 ENGINE N1 NOTED. COMPLIED WITH QRH PROCEDURES, REDUCED THRUST RETURNED N1 TO NORMAL CONDITION FOR DURATION OF FLIGHT. ACCOMPLISHED STEPS E. (4) & (5) OF FIM TASK 73-06, 809 IAW EA 800-71EA-09794 STEP 9. NO DISCREPANCIES NOTED. REMOVED HMU REF TASK 73-21-10-000-801- F00 STEPS 2A THRU 9(F)(2). INSTALLED HMU IAW AMM 73-21-10-400-801-F00, STEP G, PG 3-9 G. NO FLUNCTUATION OR FAULTS NOTED IAW EA 800-73EA-09794. VERIFICATION FLIGHT SATISFACTORY.