Yamaha me420sti, trp diesel sterndrive.

I am looking for contact with other owner operators of this exceptional diesel sterndrive unit to share, tips and data.
My engine has completed 4 years service with the only spanner going anywhere near it being to change the fuel filter and tighten the fanbelts.
The sterndrive unit however required total replacement at 1100 hours due to a small gear tooth breaking off.