What was found
AIRFRAME VIBRATION: WHILE DECENDING BETWEEN 24000 AND 15000 FEET AND AT SPEEDS OVER 280 KNOTS THERE IS A NOTICABLE VIBRATION/HUM. SEALED FWD WING TO FUSELAGE FAIRING IAW EO "E50-53-001_1" AND FOUND LAV SERVICED DOOR LATCH RECEPTICAL TO BE WORN ALLOWING DOOR TO MOVE AROUND AND NOT SIT FLUSH WITH THE FUSELAGE. SEE DISCREPANCIES 2.6 AND 2.7 FOR MORE DETAILS. REMOVED AND REPLACED WORN OIL SERVICE DOOR LATCHES WITH NEW UNITS IN REFERENECE TO OIL SERVICE DOOR DRAWING# 505-36325 AND PHENOM 300 SRM 51-41-02.