Here´s an extremely interesting article on the Colombos, specifically on the demotion of Abbatemarco and the murder of Albanese. It seems to be spot on although I´m not sure Yacovelli was the consigliere at the time. According to the article, the books were opened in early 1976.

http://news.google.com/newspapers?nid=1454&dat=19770605&id=bLosAAAAIBAJ&sjid=JRMEAAAAIBAJ&pg=6670,794725