What was found
FLT NR 381 - BOS-BOS - AIR RETURN, LANDING GEAR HANDLE WOULD NOT MOVE TO RETRACT POSITION FOLLOWING TAKEOFF. FOUND NOSE STRUT UNDER INFLATED, SERVICED NOSE STRUT FULLY. IN FLIGHT MODE WAS OBTAINED, LOWERED STRUT TO PROPER LEVEL, OPS CHECK GOOD. REF MM 32-30.