Stan - are there any written instructions from the watchtower society as to how these elders conduct these hearings--? what questions are required ? does any one know ?
Yes, The Shepherd the Flock of God book has the JC process documented. In terms of questioning this is what it has to say:
5. The committee should first seek to establish the facts and ascertain the attitude of the accused. This requires skillful and discreet questions. The judicial committee should be thorough but not inquire about needless details, especially in regard to sexual misconduct. However, in some instances, when Scriptural freedom to divorce and remarry may be an issue, details may need to be clarified. When the elders on the judicial committee feel that they have a clear picture, they may excuse the accused from the room and discuss the case and the individual’s repentance or lack thereof.
This would suggest that the Elders don't need to delve too much into detail. If they do then it's for their own benefit.
There may be more stuff in BoE letters as well.