My left AirPod is crackling, I think the speaker is partially blown out or distorted. I have AppleCare+ and thinking about doing an Express Replacement but not sure if I am supposed to send in only the left AirPod or the whole set. Not sure how I would feel about having mismatching AirPods with the left having 100% battery and the right at 95%. Considering a $1500 iPhone 12 Pro can be replaced, would they replace the whole set considering the AirPods is $250?