You have just about covered it, if there is any water in oil then you will need it serviced but they are pretty bulletproof.
Only other thing I suggest is replacing the bellows and see if you can grease the U joints, some you can some not.
I just had a complete refit done By GARTSIDE marine the one in Oak bay and they did a great job on my new Volvo system and hes a lic and registered volvo guy , hence why I went to them. just Tell Charles I sent you to him if you need work done
Good luck Wolf