I hope the CVR was working, it'd give a lot of context regarding what and why. Sadly many times the CVR is sort of neglected, the ULB will get changed on time but in my experience the functional test often gets pencil whipped. I've said it before but I'll say it again, I've walked into a hangar with an airplane on jacks and in the work order one of the tasks is a CVR functional test. I'd walk in a few days later and that task would be signed off. I know that the CVR test (again, it's not a check, it's a test) is signed off and the airplane is still on jacks. The problem is the the CVR test requires running engines. I have no idea who was taking care of Biffles jet but I hope they were meticulous and honest because they are under a big illuminated microscope currently. If they were a pencil factory they're going to be exposed.