Just de-sagged my stealth reverb. It’s an evening’s job, the most specialist tool needed was a syringe and a bit of hose with a tape marking the correct length. The hardest to find was an 8mm spanner. Apparently I have small spanners, then 10mm up. But no 8mm.
Look at the sram service video- there’s a point towards the end where it tells you how to set the post oil height. You need to dismantle the post as far as required to get the that stage (iirc it’s once the poppet is out), no further. Setting the oil height cures the bounce, then reassemble. It is very sensitive to that height though, took me a few goes.
In my experience a full service on a reverb is a recipe for scratching sealing surfaces without noticing until your post loses air and you have to ride 20 miles home standing up 😳 . YMMV of course. The innards on mine were pristine after 3 years of regular use and you can do the bushes without opening the hydraulic circuit, so why would you? The three reverbs on mine/OHs bikes are now getting bled as above and bushing replacements as required, nothing else, until they fall apart.