I had one side of the AirPod Pro replaced because it was noisy. If I sat still it was OK. If I walked each footstep translated into a thump on one side. After chatting online with a rep they scheduled a genius appointment at a local store to replace it. Interestingly enough, he connected his laptop by cable to the lightning port of the charging case and ran some sort of diagnostics that told him that there was indeed a fault in one unit.