mechanic said that I need new rear brakes

Here is a guide that will help with this:

https://www.2carpros.com/articles/how-to-replace-rear-brake-pads-and-rotors

https://www.youtube.com/watch?v=j8YwfSKEzZo&t=29s

Below you will find the process from the manual that will show how to replace this as well. Please let us know what you find. Thanks