the adjusters are relatively easy to replace the way to do it is to open the headlamp by either baking it or best invest in a +- 30$ heat gun. Take the headlamp out by removing the 4 screws holding the lamp, disconnect all the plugs there are 5 or so plugs (they are all different so putting them back is easy, note that the short beam for xenons needs to be rotated to be disconnected DO NOT just pull! ) remove the trim under the lamp by prying it starting from the inner end careful with the inner end as it has a tab that needs to be compressed to pull the trim out.
Once you have the lamp out take the bulbs out (all of them) then take the heat gun and heat the lamp around then apply a little force to separate the lamp body by the glass, you can actually gently use a large flat screwdriver twisting it between the front glass lip and the lamp body. Make sure that you first heat the lamp around well. Once the glass starts separating force it gently and at the same time use the heat gun to help the black glue separate (you will reuse it after). Now that you separated the glass from the body of the lamp unscrew the three (four?) screws holding the electrical adjusting motor in place, after you take the screws out you need to move the motor lateral to pull it out of the C nut holding it (be patient and gentle though firm these nuts are either broken or if not they are resistant so don't be afraid to work on them). Depending which of the adjusters are broken the inner plastic piece should come out easily, don't forget to remove the angel eyes just lift them up they are not held by anything at this point. Remove the broken parts by unscrewing adjuster's base and replace them with the new ones, screw in the new adjusters (the adjuster screws are the withe ones on the back of the lamp. Putting back the lamp is the exact reverse of what you did taking it apart just remember the self leveling motor adjuster arm needs to be put back not by pressing it but by moving it laterally, on the other hand the lamp mirrors need to be pressed in the new adjusters; when you get to the point of putting the glass back heat the lamp around then put the glass and continue to heat it while pressing gently the glass onto the body.
Obviously you should clean the interior of the lamp, avoid to leave fingerprints on the inner parts, etc.
Honestly the process sounds worst than it is, took me 30 minutes start to finish, so someone that is not mechanically inclined but has logic can do it in an hour or so.
Good luck and if any questions lease feel free to contact me.
