Ducati used to call for the fork oil to be changed at 12000 but I think they have moved it to 18000 or so. In my experience 18000 is the better time to swap it out.
Isnt it funny that the give a spec to change the fork oil but no spec to freshen the shock ?
The smaller amount of oil in a shock gets fried before most forks will need oil changing.
Other than changing the belts I have always done a full service at all major services. Any shop should be "checking" chassis parts (head bearings and such) because to check them takes minutes to do.
Fuel injection should be set up and checked at each tune.
belts should be checked at every tune and there should be very little to no added labor to change them ( I always remove the belts at a tune anyway)
fuel filters should be changed at each tune as it is a small filter and they are cheap enough
same for park plugs (as long as you do not have surface gap plugs)
Pretty much everything is the same.
Now here is where things can take a turn for the expencive.
By 12000 miles things may need more than "checking" final drive may need changing, Tires could need replacing. Brakes may be worn. head bearings may need attention.
Many things could need fixing and these things are not part of a "tune"
checking them may be but fixing them usually is not. This is where the $1000.00 2 valve tune up posts come from. Most of the time someone has a huge bill after a tune it also included tires or chain and sprockets etc.
Just ask the shop doing the labor to fill you n on what they do at each service and to let you know what any costs above the tune up will be.
cheers