The CVR and FDR times on page 55 do not match up with those on page 57. Some of the facts that led up to this are missing and a more comprehensive CVR transcript might have been omitted because doing so wasn't "convenient."
If the PIC has left his seat to re-set the CB's surely this would have been picked up by the CAM mike, and probably also it would have been discussed.
What happened next, and why, is an entirely different matter, and one that training will have to address.