The Department of Justices indictment (https://www.justice.gov/usao-sdny/pr/former-employee-technology-company-charged-stealing-confidential-data-and-extorting

The Department of Justices indictment (https://www.justice.gov/usao-sdny/pr/former-employee-technology-company-charged-stealing-confidential-data-and-extorting https://www.justice.gov/usao-sdny/pr/former-employee-technol...) give a fair amount of detail about what they allege happened, although it doesn't go into much details of the interaction between Krebs and the accused.