I got the trackball from Cnn.cn and replaced it myself. I found nothing under the old trackball. Somehow I was expecting that, I don't know why.
I got a blue trackball just for fun. Replacing it was easy, not more than 10 min., after watching a tutorial on Youtube. I also got a T6 screwdriver along with the trackball. It's very useful.
I kept the old trackball, it's still good. Thank you all for your suggestions.
Lao.
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