As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ATB-AIRFRAME VIBRATION DURING FLAP RETRACTION. PER WN 578203 R&R FLAP POWER DRIVE UNIT, CONTROL VALVE PER MM 27-51-28 CHECKED FLAP CONTROL CABLE FROM COCKPIT TO CONTROL VALVE. OPERATED FLAPS THROUGH SEVERAL FULL CYCLE AND CKD ALL TRANSMISSIONS & BALL SCREWS FOR VIBRATION. CKD LEADING EDGE DEVICES THROUGH FULL TRAVEL ALL ITEMS CKD PER MM 27-51-00 NO DEFECTS NOTED.