As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED DURING CLIMB BETWEEN 18000-21000 FT, THE LEFT ENGINE N1 ROLLED BACK FROM 86.7% TO 83.9% 5 TIMES. ALL OTHER ENGINE INDICATIONS WERE NORMAL. MAINTENANCE INSPECTED AND REPLACED THE NR 1 ENGINE FADEC AND THE NR 1 ENGINE FUEL METTERING UNIT,AND THE NR 1 ENGINE N1 PROBE. OPERATIONAL CHECKS WERE GOOD.