Now that they have been building XPs for 7+ years, have they made on progress on the

1. Ball joints
2. Axel
3. Frame cracks
4. Aarm cracks
5. Steering play
6. ADC
7. EPS failures
8. Bushings
9. Oil in the air filter

That plagued many of the early 850 XPs? If you were to buy 1 new right now, what "must have" parts replacement/reinforcement needs to be done?