Question Condensation on ssd controller

[Greny]

Hello.
I have a friend and he has a very strange problem: on the controller of his m2 adata 6200 ssd is appearing some kind of condensation,drops of liquid. It is also happening on one of the memory chips. Does anyone know what can be the reason? We checked for leaks from cooling pump,but nothing. The case is very well ventilated,we live in a temperate climate,now there are 20 degrees outside. The vapors formation leads to no recognition during start up of the ssd m2. This is how we found what is happening.
Any help or idea is welcomed.
https://ibb.co/PY7CrV9

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ibb.co

Thank you!

 

[popatim]

If it looks like a leak it probably is. Any mice or other type of critters small enough to get into the pc and take a leak?

 

[Greny]

The m2 slot in between waterpump and graphic card, so any leak would have been seen on backplate of graphic card. Also, the memory module which also got moisture is far from waterpump. Pc is well maintained ,cleaned regularly and placed on the on the desk.temperature of ssd is ~42°C with 20 ambient. Condensation is formed under the passive cooling radiator, between thermal pad and components. Can be that silicone from components to migrate ? We replaces the thermal pad with different one, but still after one day there is moisture forming.
Thank you!