Here is the classic 'formula' for reinstatement based on the 11/15/06 Watchtower article paragraph 8 and 9 entitled: Always Accept Jehovah's Discipline.
Clearly, then, a sinner must be repentant if he is to receive mercy. However, neither shame nor fear of exposure is repentance. “To repent” means “to change one’s mind” with regard to bad conduct, because of regret. A repentant person has “a heart broken and crushed” and wants to ‘right the wrong’ if possible.—Psalm 51:17; 2 Corinthians 7:11.
Repentance is a very important factor in connection with reinstatement into the Christian congregation. A disfellowshipped person is not automatically accepted back into the congregation after a certain amount of time has passed. Before he can be reinstated, his heart condition must undergo a great change. He must come to realize the gravity of his sin and the reproach he brought upon Jehovah and the congregation. The sinner must repent, pray earnestly for forgiveness, and conform to God’s righteous requirements. When requesting reinstatement, he should be able to give evidence that he has repented and is producing “works that befit repentance.”—Acts 26:20. Emphasis and highlights mine.
****************************************************************************************************************************** What if the person was disfellowshipped for discovery of facts? What if his 'sin' was finding out that the Watchtower society has not always taught doctrines that represent 'truth'? Or that the Watchtower society is guilty of hiding pedophiles from justice? Or that the Watchtower society has lied to it's adherents repeatedly? How does one 'repent' for becoming aware of facts? This was my basic sin. I will never seek reinstatement to Jehovah's Witnesses, but if I did, of what would I repent? It is a serious question to consider. Surely the Watchtower society has considered it - has surely reinstated some who were disfellowshipped as apostates, who had become apostate based on learning facts that were out of harmony with Bible teaching. How did they make the person unlearn those facts, to make it right? I am apostate based solely on this. I have committed no grand sins outside of this before I left. Others are surely in the same boat. Though certainly very few would ever seek to come back to this soiled organization, on what grounds could such be done? I just find it curious and would like to see some discussion on this subject. Jeff