The KS Rage-I dropper in my Stilus died yesterday...

. It doesn't want return to the extended position on its own, only by pulling up by hand.
And when extended like that, it has 20-30 mm of sag. Extra "special effects" - sipping sounds when moving up or down. I suspect that some air found the way out and mixed with oil, decreasing the pressure in the air spring. Really bad news is that in this model the cartridge is integrated with the whole moving part of the post (KS part number A3172):
KS Rage-I exploded view and it seems that it is not serviceable at all.
I've raised a warranty claim to Decathlon already. So far not happy with their reply, because they wanted me to bring the bike to the nearest store for sending to their service center (France???) From what I read here, I'm afraid it can take them months, so I've suggested sending them only the dropper (planning to install a rigid seat post as a workaround in the meantime). Let's see what will be their reply.