Online self assessment - underpaid tax included in PAYE coding (page 2 of 2)

I've almost finished completing my return for 2023/4 but I'm unclear about this section. Q1 I've either not received the Paye notice of coding for those years or have mislaid it. I can't find a copy online, is it possible to view it? Q2 The notes in my assessment suggest my 2023/2024 coding did have an adjustment but doesn't automatically say what it was, simply asking if £0 .00 is the right amount yes/no. Is there an easy way to establish this?

Hi,
The amount coded is usually pre-populated as you complete your return, so £0.00 is almost certainly correct. However, if you cannot confirm this with your own saved documentation, and would like us to check this for you, please contact our Self Assessment team.
Self Assessment: general enquiries
Thank you.