@harshgatchu , Harsh, I do not know what part or #, the tech, was going to change, Just a thought, maybe try doing these steps before changing parts, try uninstall/reinstall the sound card driver.
Go to device manager and uninstall the sound card driver, open Asus support site, download and install the latest driver there is, when installed reboot your laptop and see if the sound will work after the reboot.
If not working do a system restore, restore you laptop back to an earlier date or time before speakers had quit. Asus audio driver link below. Good luck.
I hope this helped you out, if so let me know by pressing the helpful button.
If none of this info. helps, leave your question open.