What was found
APPROX 2 MIN AFTER GEAR RETRACTION, LEVEL 2 HYD 3 FAIL CAUTION. TURNED BACK TOWARDS MEMPHIS AND PROCEEDED WITH QRH FOR HYD 3 FAIL. NOSE GEAR SHOWED UNSAFE, AFTER DISCUSSION WITH MOC, FLEET CAPTAIN, AND TECH PILOT A LOW APPROACH WAS CONDUCTED TO VERIFY NOSE GEAR DOWN. AFTER TOWER CONFIRMATION, PROCEEDED WITH THE REST OF THE QRH AND LANDED WITHOUT FURTHER INCIDENT. EMERGENCY DECLARED. REMOVED AND REPLACED NOSE GEAR RETRACT ACTUATOR REF MD11 AMM 32-35-01-4 LEAK AND OPS CHECK OK.