Challenge and Response Log Question

[Bungusbeefcake]

Hey all,

I'm new to the forum, I'm just wondering if someone could answer a question for me.

If a commercial jet is grounded by the pilots for a flight for technical reasons, what is this recorded in?

I was told that the pilots go through a checklist at the start and fill in a challenge and response log if there is any problems. Could anyone tell me if this is right and if not could you tell me what the pilots use?

Thanks