[Stvnhi]

Mold on the top trunk liner is coming from the seal that the trunk closes on.
I've had this same issue before.
As you can see in the pictures it was a rainy day when I noticed it.

Took a couple more today of it cleaned up and also where the water was pooling (between the plastic and the rubber seal)

 

[Stvnhi]

Oh man I missed one of the posts explaining this, My fault.
Yes this is the 2017 RS package.
Thank You mentioning that.
Is there an easy way of getting to the underside to check that?
Is it just pop the tabs on the trunk liner?

 

[Stvnhi]

Nice. Thank you I’ll look into this myself. Much appreciated for the correction btw lol