As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING LEVEL FLIGHT, DETECTED A SUDDEN MEDIUM FREQUENCY VIBRATION. AIRSPEED WAS REDUCED AND VIBRATION STOPPED. FOUND THE NUMBER 11 KRUEGER FLAP OUTBOARD SEAL PANEL UNDER LEFT WING AT APPROXIMATELY WS 614 TO 642 LEADING EDGE AREA TO BE MISSING. PERFORMED AIRFRAME VIBRATION CONDITIONAL INSPECTION IAW AMM 05-51-38 AND PART DEPARTED AIRPLANE CONDITIONAL INSPECTION IAW AMM 05-51-58. APPLIED INTERIM REPAIR IAW INSTRUCTIONS PROVIDED IN SERVICE REQUEST ID 3-4071766604.