HyperX Cloud II - right speaker is not working

I’ve been using my Cloud II headphones for over a year and the right side speaker just stopped working, after looking in the sound control panel to check if the right speaker is at a different volume, i found out that it is not.

I don’t have the receipt, so i can’t use warranty, i do know someone who can fix it but, i have to know how to identify the cables so i can tell them which one is the cable that leads to the right speaker.

Any sort of help would be appreciated!