I had the same problem, found a little bit of info on mtbr suspension forum. Ended up taking it apart myself and did an oil change but reassembly is a bit hit and miss as I didn’t know the correct height to set the internal floating piston, bleeding it was a pain and it is extreemly difficult to repressurise it as there is no threaded connector or valve in the pressurisation port. I don’t know how they were pressurised at the factory, must have been done in some sort of pressure chamber. As there no valve in the port I stuck a small piece of packing tape over the hole on the inside of the port before refitting the base of the shock to the main body, I then managed to get about 140psi into mine using a shock pump with a football adaptor on it, insulating tape wrapped around the outlet of the adaptor, wedge & hold it firmly in the pressurisation port & pump like mad, ended up with lots of swearing & very sore hands. The ‘tape’ valve was a bit hit & miss, took a long time before I managed to make it work. I didn’t replace any seals, but the shock has continued to work brilliantly for about 8 months since I serviced it, not looking forward to doing it again though!