I recently changed the seals in a NLG steering actuator swivel on an A330. The CMM quoted part numbers for the seals, the AMM didn't have a reference for dismantling or reassembley of the swivel. As far as I was concerned it was just basic engineering using standard torques on the retaining bolts and standard methods of replacing seals.......all covered in chapter 20. Of course the function and leak check was carried out IAW Chapter 32 of the AMM. I had no quarms whatsoever that everything I did was to the book. Now as far as taking a more complicated component apart in order to change some gizmo that I have no knowledge of what it does or how it works then that's a different matter. Use common sense but also use chapter 20.