What was found
AFTER TAKEOFF, NOSE GEAR WOULD NOT RETRACT. RECYCLED GEAR, NO HELP. RETURNED TO BHM AND MADE AN UNEVENTFUL LANDING. INSPECTED AND FOUND HYDRAULIC FLUID AROUND SWIVEL. REMOVED AND REPLACED RETRACT LINE TO LOCK ACTUATOR, RESERVICED SYSTEM, AND RETRACTION TESTED NOSE GEAR PER BOEING M/M.