As Aaron wrote, if you have paint leaking into the trigger area, the needle bearing is leaking. Badger does not recommend that you try to change it yourself, and they will do it free for life. I would contact them.
If you have been cleaning too agressively, you may have damaged or even ejected the needle bearing. It's very tiny. Looking in from the front of the airbrush it looks like a tiny white ring.
The air leak from the little MAC valve is something else. It's due to clearance in the threads. A tiny leak isn't going to hurt anything and you can reduce it by applying a little Chapstick to the threads. But, complain about it to Badger and see what they say. Maybe they have a better fix.
Don