Macbook Pro 16" Water Damage

Hello everyone!

My Macbook Pro has trackpad issues, battery issues, and graphics lag.

In total I have sent it in for repair 3 times for these issues (and twice previously for other issues).

The first two times I had the logic board replaced, while the third time was discontinued as I received a notice from Apple that liquid damage was found and therefore I have to pay the repair costs.

They attached the following picture: I do not see any sign of liquid damage, I only see a brown stained aluminum part.

They can't repair it four times and at the fifth time refuse to, accusing me of having broken it.

I have never spilled any liquid on this Mac.

How can they say those stains are liquid and caused all the problems?

Thank you very much

Photo: https://ibb.co/t83mf08