What was found
(REF NR: MOR NR OCC442) OPERATED FLIGHT NR 101, VFR CONDITIONS, FLIGHT AND APPROACH LANDING WAS NORMAL. AFTER LANDING, ROLLOUT FLAPS WERE RETRACTED. WHEN EXITING THE AC IT WAS NOTICED THAT THE INNER FLAP ON THE PORT SIDE WAS STILL DOWN. THE FLAP WAS MANUALLY RESET TO ZERO, AND THE AIRCRAFT WAS FLOWN BACT TO DEPARTURE AIRPORT. A FLAPLESS LANDING WAS CARRIED OUT. MAINTENANCE FOUND THAT THE LT IB FLAP DRIVE ASSY HAD FAILED. THE 2 LUGS THAT TRANSFER CABLE MOVEMENT 90 DEGREES INTO ACTUATOR MOVEMENT HAD SHEARED. THE LT IB FLAP COULD BE DEPLOYED FROM THE (UP) TO THE (DOWN) POSITION, BUT HAD TO BE RESET TO THE (UP) POSITION MANUALLY. THE LT OB, RT IB AND OUB FLAP DRIVE ASSY`S, FLAP GEAR BOX AND DRIVE ASSY, PN