1.) Where do I send something in for repair? Do I need a return authorization number? How long is warranty? Do I need to send a proof of purchase?

Please visit: www.sennheiserusa.com/serviceandsupport_repair and download our service form, which contains all necessary instructions and pricing. Our detailed warranty conditions can be found in our Service Policy. In all cases a proof of purchase will be necessary.

2.) I tried to get this part through my dealer, but they tell me it is not available anymore...

For hard to find parts, please send us a service email.

3.) So do you guys have a "flat rate" for repair?

Yes. For more information, please visit our service area here

4.) What is the repair cost?

Repair cost minimum is $35.00 to evaluate the unit. This cost is included in your repair if you decide to have the unit repaired.

5.) Where can I find your Warranty and Service Policies?

Please visit: www.sennheiserusa.com/serviceandsupport_warranty.