What was found
LANDING GEAR LEVER WILL NOT RISE. ACFT PERFORMED AN AIR TURN BACK. LANDING GEAR DOWN LOCK PINS INSTALLED IN MAIN AND NOSE GEARS. LANDING GEAR LEVER LOCK C/B OPENED AND COLLARED ALTN. POSITION SWITCH SELECTED.REFERENCE W/O 16819 ITEM 8, PERFORMED T/S IAW 757 FM AND FOUND RT. MLG TRUCK ACTUATOR DEFECTIVE. REMOVED AND REPLACED RT MLG TRUCK ACTUATOR IAW MM 32-32-15. PERFORMED OPERATION CHECK IAW MM 32-3200 PG 501-504, OPERATION LEAK CHECKED NORMAL. THIS CLEARS DMI 22589, PLACARD REMOVED.