What was found
AFTER T/O GEAR HANDLE WOULD NOT MOVE TO THE UP POSITION. GROUND SENSOR WAS NOT A FACTOR SINCE PRESSURIZATION WAS NORMAL AND A/P ENGAGED. CONSULTED QRH BUT DID NOT USE THE HANDLE RELEASE BUTTON PER MOCC. RETURNED TO DEL. INSPECTION FOUND FLUID DRIPPING FROM TRIM CYLINDER PRESS RELIEF VALVE ON RIGHT L/G. REMOVED AND REPLACED AS PER AMM-32-37-03-4. ADJ/TEST & OPS TEST OF TRUCK BEAM TRIM INTERLOCK CYLINDER C/O SATIS AS PER AMM-32-37-00-5. GEAR HANDLE MOVEMENT CHECKED SATIS VIA USE OF OVERRIDE BUTTON WITH GEAR PINS INSTALLED. SATIS INTERACTION WITH INTERLOCK CYLINDER. HYD SYS NR 3 RESERVICED TO FULL. RETURNED TO SERVICE.