Astra VXR stem seals and Sorting out some little issues

In this video we have al buds Vxr just sorting out a few ongoing issues with it one being the stem seals but in doing, so, we come across a few little wishes to sort out one with the spark plug covered in something the rocker cover was leaking so it possibly was oil leaking onto the spark plug and actuator had a split in the pipe and just to confirm the actuator runs under pressure not vacuum I know I said it wrong in the video but is pressure not vacuum