Yes. This white spot is a water damage indicator.

There is a white rectangle on the top left of the motherboard. Is this a water damage indicator as well? I send my phone to HandTec (official EU repair center for OPO) in order to fix the classic touch screen ghost issue, and they diagnosed my phone with water damage. In the image sent to me as a proof for water damage, this rectangle is redish, so i thought it might be just another water damage indicator.Can you please confirm that?Thanks for the great guide.