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1. Remove the right earpad.
2.Remove the small black stickers wich comouflate the screws.
2. Undo the screws wich tighten the ear piece.
4. Upon removing the ear piece, On the upper side of the ear piece you will see a line of several contacts wich are coresponding to contact surfaces on the ear piece.
5. Clean the lot with oilless contact cleaner. Await the cleaner to dry for few minnuts.
6. Essamble the ear piece as you desmantled them.
7. Victory!!! It should work OK.