Thanks for the information on Crossair. From what I can access from google it doesn't list the causal factors do you have a link that highlights these?
Sure! This is the full report in english language:
http://www.bfu.admin.ch/common/pdf/1793_e.pdf
It is really worth reading the whole 162 pages, but if you want to look at instructing as a contributing factor to the captain's fatigue, start with chapter 4.2.4