That's what I figured I might end up going with, but when I showed my wife a pic of the CI filter and told her it was $300 she about stroked. I was hoping there was another 'cheaper' possiblitiy for a fix out there. I didn't have this issue with the 7125 or the 7075. Apparently it can be a common issue with amps and residential A/C service, but it's kind of sad that you have to spend another $300 to 'fix' a $1,500 amp.