Hopefully someone can help. I press the open button on the keyfob/inside the door and the tailgate opens. It's a bit jerky (not very smooth) but that is not the issue. It gets to the fully open position. When the motor stops the tailgate then lowers toward the close position (just a couple of inches (not sure if this is normal). But then, slowly at first the boot closes under it's own weight. It's actually quite dangerous because it does end up slamming shut. I have disconnected both struts. Both offer significant resistance, albeit one more than the other. The left one I can compress with a fair bit of force, the right one hardly moves at all without hurting the palm of my hand. There are no significant signs of oil leaks on the struts. Any ideas please?