V10 - dirt and maybe moisture in control board enclosure - is this common?

[Zopper]

I have a relatively new V10, bought this spring. It should be the one with better sealing (Liam said so on the IM channel when I asked). Today, I opened the electronics box as I'm changing the tire, and found out that there is quite a lot of dirt at the bottom part of the power board - at mosfets and around them. See the photo.

The upper half of the enclosure looks clean. I don't see any water (it's a few days since I rode in a rain), but the dirt is attached to surfaces in a way that suggests that it was exposed to some moisture. But it could be some thin oily coating as well. I don't see any rust. I already wiped some of the dirt on the photo to check that. Do you think I should remove the board and check it from the other side and possibly apply a better sealing, or is this ok?