Chapter 2 - 3 Secret guides?

[KoopyVegeta]

Hey there, was wondering if anyone knew a good guide for finding secrets in chapters 2 and 3. Able to find the majority of them however ones that are hidden behind walls are a mystery to me

[Soüp]

This website has guides for every level as far as I can tell. Their image hosting servers aren't working (haven't been for days, not sure what's going on) but the text descriptions are good enough to follow fairly easily. I haven't found an index for the guides but you can just change the numbers in the URL: https://itemlevel.net/warhammer-40k-boltgun-all-secrets-chapter-2-mission-1/