As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE NR 4 POWER FLUCTUATES, FLUCTUATIONS CANNOT BE ELIMINATED. N1 VARYING +/- .3 SEE PREVIOUS WRITEUP ACARS WITH CREW IF OTHER ENG IND FLUXING ALONG WITH N1 AND WAS INFORMED, OTHER PARAMETERS APPEAR NORMAL EXCEPT FF 300PPH HIGHER THAN OTHER ENGS. CLEANED N1 CONNECTOR AND RAN NR 4 ENGINE AT FLT IDLE FOR 10 MIN. NO FLUCTUATION OF POWER NOTED.