Hello,
After finding a post here with description of clunking noise due to idler pulleys I decided to replace mine as I thought there is similar noise.
Replacement is straight forward, and did one at a time, below you can find photos on the gunk I found behind the pretensioner, I hope it is all from pretensioner and not TCC.
Also pretensioner was completely destroyed check the photos.
After replacement no more clunking noise and hydraulic pretension is much harder to pull compared to old one which means the old one lost all it's oil.