I was a subcontractor for the Quebec region when that happened. I prepared training for post-assessment corrective action plans. All the documents containing elements of that training simply disappeared. All the Transport Canada internal documentation was removed from the department's website. The guidelines and personal instructions were removed.
Afterwards, some of those instructions were put into advisory circulars. The difference between an advisory circular and personal instructions is that advisory circulars don't have to be followed, whereas a Transport Canada inspector must follow their personal instructions.
The documents are identical. However, the purpose of those two documents is not the same.