Hopefully resolved
Last week the amp in my 2010 Mazda 3 went nuts. Out of no-where this horrible sound (helicopter as previously described) was nearly unbearable. After pulling the 30-amp fuse, I could use the car once again.
After reviewing this site, some YouTube videos and the like, I placed a call to Bose Automotive (800-231-2673)... pressed option "1" (already contacted my automotive dealer)... then option "2" (speaker or amplifier).
I too had to leave a message... I described the problem... how I got it to stop (by pulling the 30-amp fuse), the year of the car and my contact information. It was a Friday so my expectation was low on receiving a returned call. To my surprise, the following Monday, I received a call from a Massachusetts number (nearly didn't answer it b/c I thought it was a sales call). The support representative was super nice and directed me to their website.
I submitted the contact form (automotive[dot]bose[dot]com/contact-us) describing the problem as directed. Per the support representative, that is the first step. The next step, I should receive an email from them, where I have to take pictures of the amp and send them back, then they will send me a replacement amp.
So... in the coming days I hope this issue is resolved.