2016 gsa, like I said I took it to Williams bmw and they couldn’t sort it, I spoke at length to the engineer and he always helpful but this time could not offer any advice except to tell it would not work.
I was just replying to some else’s thread telling of what I did.
First of all, it's not my attitude that the BMW mechanics are stupid or ignorant, but they have to obey by the BMW philosophy, which is to not repair stuff, but rather exchange broken parts with new parts. And quite often, that is a good idea,
If the issue for the schock is a stuck ride height system, caused by the gear not being used for a long time, relubricating the old part may do the trick.
BMW prescribe a test procedure, and the shop HAS TO obey by it, or else they run the risk of getting an rather unpleasant attention from the mothership. The BMW procedure in this case is to run the diagnostics, and when the ride height motor is stuck due to a stuck gear, the system throws a fault message, and the only way with BMW is to replace. There is no BMW procedure to lubricate the ride height adjuster motor and gear in the rear schock.
Back in the days of the K1300 series, this was also an issue. At the time, BMW issued a bulletin that described how to disconnect the schock connector and hook it up directly to the battery. I've seen it, and used it once on the K1300GT for a friend of mine.
Now, the R1200 schocks may of course be different, and this may be only nonsense from my part (which, according to my better half, is the rule rather than the exception.)
However, since the schock in the video looked quite similar to the older ones, and the OP's schock is already out, it wouldn't take much effort to dismantle the motor, like shown in the video. And, as shown in the video, tha adjustment shaft is easily turned by hand when it's ok.