Discovered that water has seeped in and damaged the raw board on the entrance roof.
It hasn't leaked through the roof as far as I can see, but has probably seeped in from the side or from above through a gap in the facade that should have been sealed.

The tricky part is that there is a balcony with a standing seam metal roof above the entrance roof, so it's not so fun/easy to access from above.
It's not easy from below either, as you can see in the pictures.

My thought is to remove some facade boards + fascia board and remove the damaged part of the raw board to replace only the damaged section.

Do you think that's a good idea? How would you have done it?

Damaged fascia and gutter with temporary sealant on a building exterior; a ladder is placed nearby for repair work access.

Water-damaged roof section with temporary sealant applied, next to white drainpipe and wooden siding. Damage marked for repair.

Below you can see the moisture-damaged board, the arrow shows the damaged part I plan to remove.
I will remove the fascia board + facade board to get better access if necessary.

Water-damaged wooden board on porch roof with temporary sealant. A blue arrow points to the damaged area intended to be replaced.

The sealant is only there temporarily to prevent more water from seeping in :-)
 
Why not leave it open until you know where the water is getting in? Sealing it is good, but it could just as easily be that the water continues to seep in, and then the shell is so tight that it instead damages something inside the wall in the long run.
 
Agree that it's not good to seal if you don't know where it's leaking.

Now I'm quite sure that it's been leaking in two places.

The first place is where the fence post is attached to the wall, there was a large gap where I put the sealant, the water got in between the metal sheet and the facade board there before.

The second place is the roof sheet right by the facade, I had cut/folded it so it drained towards the facade instead of down into the gutter.

But you can never be completely sure, that's why I'm considering removing the facade board and the fascia board so I can see more of how it looks...
 
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