Bought a used CMC6 from bleep's rental department recently. They cut me a decent deal so I won't mention who. I bought another CMC6 and when in comparison I realized it had a higher gain range and virtually no noise floor compared to the one I bought from bleep. I changed out capsules, mixer, and cables so I know those are out and that it is specifically the preamp. It has also changed gain structure suddenly a few times. I was sitting in an interview and it jumped more than 10 db very suddenly.
Just seeing if anyone has experienced this and what options you sought out to fix it. Would rather not send it to Germany.