None. Just regular maintenance annually. I had the starter and alternator overhauled (brushes/bushings/bearings/etc) just because around 90 thousand even though they were fine.
Never had an actual breakdown with this bike.
I rolled 100000 up this year while riding in Michigan. Unfortunately my riding season has been cut short this year because of bypass surgery so I've only managed a little over 2000 miles since then. I have another 5 weeks before I can start logging miles again.