As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAPTAIN REPORTED LEFT ENGINE WITH OSCILLATIONS IN ALL ITS PARAMETERS. THE COMBUSTION CHAMBER WAS SERVICED AND WATER TRAMP WAS DRAINED IAW 72-40-01, ALL CORRECT. DURING OVERNIGHT SERVICE LEFT FCU WAS REPLACED IAW MM 73-12-01 AND THE LEFT ENGINE WAS TESTED IAW MM 71-00-00, ALL CORRECT.