What was found
(CAN) DURING APPROACH, UPON FLAP DOWN SELECTION, FLAP LOCKED. FLAP SYS 1 WAS ALREADY ON MEL. ADJUSTEMENT FLAP TRACK #3 #4 #5 FOUND OUT OF RIG, ALL ROTARY FLAP DRIVE ADJUSTED IAW AMM 27-54-00-820-809A. FLAP ROTARY ACTUATOR WERE REPLACED DURING LAST C CHECK (JUNE 2019) AIRCRAFT RETURN TO SERVICE (TC# 20190711015)