On the CVR:
I believe the incident aircraft was C-FKCK, msn 265 delivered in 1992 -- so it may only have a 30 minute CVR installed in compliance with Canadian regulations.
The go-around happened by 02:56 UTC. After the circuit, AC759 then landed at 03:11 and arrived at the gate at 03:15. That's 19 minutes.
So unless the pilots pulled CBs within 10 minutes of the gate arrival (while passengers were still disembarking), the CVR might have been completely overwritten in any case.
And I'm not even sure it's standard procedure for AC pilots to pull CBs on their own after every possible reportable incident. Probably the pilots were told to "call the tower" at this point and were still wondering / discussing what had just happened amongst themselves.
25-hr CVR rule would have made a difference here.