[Aquinasfan]

Does scripture give us the duties and responsibilites of this tribunal?

Does Scripture tell us that we should look to Scripture alone for answers to questions like yours?

No. But Scripture tells us to take our disputes "to the church." And "if he refuses to listen even to the church, treat him as you would a pagan or a tax collector (Mat 18:17)." This is consonant with the fact that the Bible calls the church "the pillar and foundation of truth (1 Tim 3:15)."

Where and how does the tribunal establish their authority?

The tribunal is a group of priests, religious (nuns and/or brothers) and lay people appointed by the bishop, who is a successor of the Apostles.

Luke 10:16

"He who listens to you listens to me; he who rejects you rejects me; but he who rejects me rejects him who sent me."

Why do you look to Scripture alone for answers to questions like this, when the doctrine of Scripture alone isn't in the Bible? Where did this doctrine come from?

[PFKEY]

If what you say is true then what's the rub?

The tribunal has the authority to do what it is doing.

I would think that should be the end of the story.