German publication Motorrad has posted a 50,000km teardown of the Multi online here
Reads quite well in google translate. Note there are five pages, including a response from Ducati.
Basically, the Motorrad testers were happy with the state of the bike except that the big-end shells showed signs of wear, albeit within tolerance.
The other issue they had was the exhaust flapper valve (i.e. noise reg beater) seizing solid, which demanded a replacement of the cat unit,
Oh, and the chain lower run wore a groove in the swingarm, which also was replaced.
That last problem perhaps gives a clue to the nature of the 50,000km ridden, as the tester admitted the sprockets had got saw-toothed and the chain was very worn and slack.
So perhaps the big-end wear had arisen from cold-weather commuting with little warm-up time. Who knows.
Rest of the motor was in great shape, and compression was higher than when new.
50,000km ain't a lot, tho, in the scheme of things, especially given the price they are charging.