As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
VIBRATION FROM NR 1 ENG, FELT IN FLIGHT DECK. NEED TO ACP TAP TEST INSPECTION OF THE NR 1 ENGINE FAN BLADES. ACCOMPLISHED TAP TEST PER AMM. ALL BLADES HAVE AN ACCEPTABLE VALUE. ACP'D LP COMPRESSOR (FAN) ONE SHOT METHOD TRIM BALANCE PER MM. OPERATIONAL TEST GOOD.