Yes it's supposed to start with another member bringing it up in private, then maybe reaching out with several members, then bringing it before the elders, etc.

Yes it's supposed to start with another member bringing it up in private, then maybe reaching out with several members, then bringing it before the elders, etc. Missing church every Sunday would be particularly visible, especially in a very small church, so a pastor might want to have a conversation about it. I suppose most other issues would come about from other members... in the most extreme cases the church should hand the individual over to the civil authorities (a husband beating his wife, a leader molesting children, etc) Sadly that sometimes doesn't happen. But there are a lot of edge cases and wisdom issues, so generally if there's not a clear teaching, the church will leave it as a matter of conscience.