Unfortunately the the warranty Bose’s Quiet Comfort 35 ii is limited to 12 months. Thereafter it is considered unrepairable by Bose. Bose (Australia) does not support its products after the warranty period expires, they simply tell you to buy a new pair.
My right speaker also died shortly after the warranty expired. Called Bose only to find their theory of customer service has alligned itself with the throwaway mentality of a dollar store. “Sorry sir we do not repair the earphones but I am happy to sell you another pair.”
I would be very interest to find where I can buy parts to repair my set.
My advice to anyone who is thinking about buying a pair. Think about after-sales repair service, especially out of warranty.