What is the laser autofocus module's serial number?

Due to a meeting between my phone and the floor,

I can take pictures from my rear cameras,

however I can't focus.

I suspect that the laser autofocus is defective.

Can I replace the module by itself?

If yes - then what is the module's serial number?

If no - what do I need to replace? What's the part's name?

How much should it cost me?