How to do fault diagnosis for planetary gear?

Hello everyone, I use matlab simspace's own planetary gear model for gear fault diagnosis. Now I have three questions:

1. How to build a planetary gear train model with three planetary gears?

2. I want to do gear missing tooth fault diagnosis. Should I change those parameters or existing models to simulate the faulty gear?

3. I am going to measure the speed or acceleration of the sun gear, but the idea translation motion sensor module cannot be connected to the existing model. How to connect it?

I would appreciate it if you could help me!