New A6 2011 60 plate head advice please

[a6allroader]

Hi all
I've just purchased a 2011 60 plate A6 2.0 tdi Special Edition.
I know it has the CAHA engine but have read lots about issues with the cylinder head. I've tried to spot the head reference number but couldn't see it. Can anyone help please in terms of weather this year/engine wouldn't have problematic head and how id find the head reference?

Thanks folks