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Dan, if you are still having this problem, before you visit your "stealer" , access your APIM ( the component you guys are doing your secondary USB mod to) and with the key off, unplug the APIM, wait a few minutes and plug it back in. This will likely fix your concern.
APIM (Accessory Protocol Interface Module)
FSM
WTF is that?!?!? lol
Got the new microphone installed today. They replaced the microphone and I asked them to not just plug a new one in replacing the previous one but to replace the wiring (per Brian's recommendation). They pulled the headliner and found "bad wiring" and they replaced it as well so I expect that this is the end of the "replace the microphone again" cycle.