G925F - Blue LED glows when vibrating

Hello guys,
i have got a problem with my waterdamaged G925F.
In the testmenu(*#0*#) the red notification LED is working, not the blue or green one.

Now the strange thing:
When the phone vibrates the blue LED glows. Even without the vibration motor connected, the blue LED glows. I cleaned the mainboard completely but i cant find a faulty part.
The LEDs are working fine. When the phone is turned off and charging, the red LED is glowing. When it's fully charged the green LED starts glowing.

Does anybody know how to fix this?

Thanks in advance

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G925F - Blue LED glows when vibrating