Its not at a specific line just search in notepad (ctrl + f) the word "keystore" without quotes
Or look manually through the file to find if it contains any extra private key in the form
L2swqzRoGrinNgTt9nzf28UUgmTtZgtpfREDACTEDREDACTEDREDA or 5K6eoShWWsgptas3XYGL34xcj66Bn1tREDACTEDREDACTEDREDA
I did as you asked and I see a lot of private keys, labels in the labels section, I tried to save just private keys and import them for recovery, but it only restores those addresses from the seed
https://ibb.co/VH9vMyb