My C414 XLS microphone is about seven years old and probably due for a cleaning. Do you provide a maintenance service? If so, where can I find this information?
Harman doesn't provide a maintenance service, there are some online vendors that could do some cleaning. We do repairs if you feel your product needs repair. You can reach out to AKG for further support information. - https://www.akg.com/support-product-detail-pro.html#prod=C414 XLII&tab=contact