Volume button spring is broken

I believe there are two springs under the volume control button. As you press the button to lower the volume and then release, the button returns to its previous position. Similarly, the increase volume also springs back into place upon release.

I know they’re separate because the + Volume has no spring left while the - Volume has maintained it spring.

Do you have instructions on how to repair this?

How much to purchase these instructions and the micro-springs?