Atlantic Cowboy, you state the following about spreadsheet:
It certainly does not contain the airworthiness audit trail because that was not the purpose for which the speadsheet was designed.
Happy to accept your word on this, you were there. However can you enlighten us if there was a seperate document drawn up that recorded the airworthiness audit trail as part of the investigation and if such a document exists has it (to your knowledge) been made publicly available?